Sounds like maybe Sensory Processing Disorder, on the high-functioning end of Autism.
My daughter has it. Had Severe speech issues when younger and was in speech at school from age 3 through grade 6. We had her in early-Childhood class when she was 4. That's when they decided/discovered there might be more going on and they did further testing; discovered she had severe hypotonia. She was in OT/PT from age 4 until 4th grade. She was terrified of riding a two-wheel bike; she finally learned how this summer at the age of 12 years old. She still is terrified of swimming/the pool; she says it's like a bottomless black hole that's going to swallow her up, even though she knows that's not true (she and I have been going to the pool together, and I've gotten her to jump in for me). Because she needs time to think about and evaulate if/when she does something, to this day, she has been unable to pass a swim class with other classmates in it. We're thinking we might have to go the individual class route.
She got glasses when she was 3 years old--had Strabismus and is far-sighted. She might possibly grow out of needing them (crossing fingers).
She had her first pair of ear tubes at the age of 5 months, and two more pairs before the age of 3. However, we caught the issues early enough, and she has no hearing loss.
She has had her adenoids out; they were WAY too big for her nasal cavity.
When she was 7 years old, she had her tonsils out. She'd been having system-wide strep infections; they found her tonsils full of strep when they removed them. Since she had her tonsils out, she had one ear infection and no colds or flus since (it's been 5, going on 6 years).
My daughter has issues with being active/sports because of her hypotonia. She is very slow and doesn't have much gumption. It takes more of a push for her to get herself motivated. But if she likes something/wants to do it badly enough, she is old enough now that she motivates herself. She has been in dance class since the age of 4; this might be her last year, though, as she is interested in getting more involved in school activities.
She is very interested in and has been doing well playing her tenor sax in band (we've been getting her private lessons). She is well-above her classmates in terms of reading and reading comprehension (she's reading adult books). She made the Dean's List the first quarter of 7th grade this year. She still struggles with social skills and making/keeping friends.
When she was 7, my husband and I found out we had a casein allergy as well as a gluten and soy intolerance (our daughter has a gluten intolerance and was allergic to cow's milk as a baby). We took gluten, soy, and cow dairy out of our diet AND changed over to organic. THAT made a tremendous difference in our daughter's overall attitude (she's been very agitated as a baby/toddler, and was constantly beating her head and saying she was dumb, stupid, that she shouldn't be here because she couldn't do anything.). After the dietary change (gluten and casein free diets are often reported to help children on the Autism spectrum), we saw a remarkable change in our daughter for the better.
I do not believe that Autism or Autism Spectrum Disorders have a genetic issue. I think it is more an environmental issue because of all the toxins we currently have in our environment, as well as GMOs in our food supply. I also think their little bodies are full of neural-damaging toxins/heavy metals. I had both myself and my daughter tested for heavy metals; we both tested positive for severe heavy metal toxicity. We both detoxed. The detoxing also really helped my daughter function a lot better.
Along with eating organic, we cut out processed food/preservatives, fast-food restaurants, we have a reverse-osmosis water filtration system on our drinking/cooking water in the kitchen, we only buy organic/free-range meat and eggs, we don't eat artificial sugars, MSG, aspartame, dyes, flavorings, chemicals/pesticides, etc., etc. In other words, we try to eat as natural and organic and off the land as possible to cut out any and all unnecessary exposure our daughter might have to any harmful toxins.
My daughter also takes lots of different supplements--all very high-grade, high-quality (we buy from Whole Foods or vitacost.com): Calcium/Phosphorus/Potassium, multivitamin/mineral, Vit D3, Vit C, 10-mushroom complex for immune system, Vit E/EPA/DHA, and a Vit-B Compound (because of the gluten issue, her body doesn't process the Vit Bs correctly), etc. Supplementation has also gone a long way to making her healthy and giving her a strong immune system.