Yoga Question

High blood pressure, sinus, cold..

That happens to me when my sinuses are having issues.

But if it bothers you/your head when in that position... I would not hold that position for very long. Plus it gives you a headache.
I for one, cannot be in that position for very long.

It might just be all the blood rushing to your head for that pose causing head pressure

Because gravity is pulling our blood towards our toes daily, it will seem odd to have blood moving toward your head. This is one of the benefits to having the head upside down.
You may feel a bit lightheaded which could be a symptom of dehydration (we should drink 1 liter of water/day).
You may feel a small amount of pressure as if the blood is moving toward the crown of the head.
You should not feel like your head is going to explode or have a headache.
I'd recommend upside down for shorter periods of time or skipping those poses until you practice yoga a little longer.
Yoga should feel good and be fun...

please get checked for high blood pressure or a possible sinus infection.
Do you use a neti pot? It can really help with the sinus issues.

For me... that means sinus problems. For others it can be blood pressure. ALL sorts of not good things can happen if it's blood pressure. So go see a doctor to find out.

However, I can't do yoga. Don't get me wrong, I can do splits 3 ways, hold a handstand for several minutes, flips, all that jazz... but I do things as a gymnast or dancer does them. Yoga requires joints to be in different positions than dance and gymnastics, and it requires holding instead of movement. Every single time I've tried yoga I've ended up injured. And I have an athletic background. What that background has taught me, however, "If something hurst or feels 'funny' go see a doctor. Asap."

Not a good sign to have such pain and pressure.

I had the same problem when I started restorative yoga, a class designed for healing. I suffered a TBI (traumatic brain injury) though and started the class knowing that my head/neck/brain structures were cleared for exercise. It took months to stop the throbbing and construction noise sounds from putting my head in a downward position. The noise was so loud in my own head that I could not hear the instructor. But I am sooo glad that I stuck with it. Yoga has really improved my health in more ways than any other exercise.

So perhaps ease into and out of the position. Make the transition just as important as the pose. Don't move quickly until you have had experience with the positions. If easing into it doesn't help, then checking with your doctor would be the next reasonable step.