What is wrong with me I am sick all the time? Best Answer 10 points!!!?

This past Saturday I went to Alabama Adventures. I rode two rides then I started getting dizzy which I just thought I got kind of sick from the rides. Then I was in line for another ride then started getting nauseous so I told my husband I needed to get out of line and sit down. Well I nearly passed out so I started projectile vomiting ( I know its gross I'm sorry) everywhere everything I drank it came right back out. But I know what that problem was it was heat exhaustion but I had and still having stomach problems I have gained so much weight in the past 3 months I very seldom eat to be able to gain weight. I have real bad headaches,stomach pains, insomnia, and I am very tired all the time I just thought maybe someone who is reading this might be able to tell me what to do. Oh and I have had a knot on my head for three months now and I have so many people telling me I am a hypochondriac so please nothing hateful cause this is very serious and I wish I could go to more doctors about it but I have no health insurance please help me or give me some helpful advice