Ive Been Pretty Sick Since Mid July. I Had Tonsillitis

Ive been pretty sick since mid July. I had tonsillitis in July, mono in October, 4 yeast infections since July, and the flu in November, and I now have a cold. I've also had a strange amount of canker sores in my mouth and had a non itchy rash on my stomach from October until the beginning of December. My lymph nodes in my neck have been constantly swollen since the tonsillitis in July. I recently became sexually active in May and am nervous that one of my two partners could have given me something. I was tested for ghonerea and clamydia towards the end of September And was tested for HIV at the end of October. All three came back negative. But I can't help but keep thinking something is wrong with me because I keep getting sick. I've had my blood taken numerous times and my doctor keeps saying everything is normal even though my lymphocyte level is about 8% higher than normal and my neutrophils are about 10% lower than normal.