What do you recommend for someone with my medical conditions?

Alright, as you may already know that I am not a big fan when It becomes to doctors. I’m 15 and not so healthy at the moment. Unfortunately, I was diagnosed with very severe allergies, no other family members have it (except for asthma).
Considering that I’m “special”, the severe allergies has cause me to have a benign tumor (Some doctors call it a giant polyp) in my sinus area. Basically, pushing against my skull. Which has caused to have very little focus, unbelievable headaches, toothaches, Bleeding gums, withdrawn personality, oxygen deficiency, etc…
They took out the giant polyp and the smaller ones at about… 4 months ago. Surprised that they said “That was the biggest I have ever seen”. Certainly, I got very frightened. I did a bit of blood work (taking blood out for observation) at a office, and my immune system seems to be dangerously low. I thought that my immune was pretty normal and I usually don’t get sick until every few months with a flu.
Now that I had taken the shot that will increase the cells to fight off viruses, bacteria, etc. I’m prone to getting sick at least once a week. Constantly on and off with the symptoms of acid re flux disease, stomach cramps, head colds, chills, flu. The sickness has been going on since October 20, which is unforgivably my birthday. No matter what the doctors have given me, my body seems to be very drug tolerant and not taking any affect. Except, the horrible side effects; included Hallucinations, constipation, strange dreams, etc.
The sickness would last up to 3–7 days and come back less than a week later, unable to focus on school
. It seems that I am a “Health nut” and this is happening to me; I take vitamins every day, nice 3 organic meals a day, allergy free room, full sleep. Other than that, the sickness is keeping me from working out. What do you think is the best decision for my body and mind? Any natural remedies? Also, I’m wondering if poor memory has to do with the giant polyp? (If, this paragraph does not make any sense. Please correct my mistakes)