For about 3 years, I have had very random "tickling" sensations throughout my muscles all over my body, where it feels like my limbs or tongue are numb and light as air; but when I feel them, they are not numb and I can interpret feeling normally. So during feeling this I will panic that I won't be able to talk or move, but of course I am always able to do both normally. The tickling sensation is usually met with faintness.
This is met with some insomnia (where I am wide awake until 2 or 3 AM), daytime fatigue, and constipation. This all started after a flu bug that had me vomiting for 24 hours straight, after which I became lactose intolerant and food-sensitive to potatoes (when I eat them I get a headache and fall asleep almost immediately.)
I do tend to stress, and my current worry is that this is caused by a brain tumor. I have no medical history except meningitis as an infant. I am 19 years old, 5'1 and 140 pounds. (30 lbs overweight).
What do you think is wrong, what should I do?