I have a real sensitive 11-yr-old. He has been diagnosed with high-functioning autism but I don't think that makes a difference in how I respond.
He will cover his ears at loud noises, hold his nose closed digging out a scoop of cat food to put into their food bowl, and always wants his bath water cold.
I have found that I will tell him to pick up his dirty clothes. A few minutes later I tell him that it is time for me to look in his room, closet and the bathroom upstairs. I warn him that this is when I will have him give me a quarter for every dirty piece of clothing (one sock: a quarter, shorts+shirt+2 socks: 4 quarters). I smile when he, sometime, wait a minute, I want to check one more time. ;)
I like the response from Flaming Turnip - need to try that one myself.
I see your first plea for answers is "how do I get my overly sensitive child to communicate?" Maybe he needs professional help to work with him with using his words to describe his feelings. I wish I had made such an investment (with professional help) when my son was younger. (Ever hear of Pragmatic Speech therapy? It involved a lot of learning what words were appropriate to the given situation. Well worth it for my son. The public school referred me to a speech therapist.) There are so many "feeling" words! Dry, flaky, itchy, sweaty, heated, cold, rough, scared, startled, panic, ...
I believe my son's cries are real but I can empathize and still make accommodations.
Something I haven't heard suggested is to ask him to wash himself. Tell him he's such a big boy that you want to see him do it without your help. If he doesn't like water on his face, ask him to clean for suggestions. Would he wash his face with a damp wash cloth? If it works, then that's great!
I have worried a bit about when it seems he's "crying wolf." That worry got me to remind him that complaining or talking about it was the more appropriate (usual) response rather than crying. A lot of times I'll let him cry as long as I know he is in a safe place.
Good luck!