Constant bodily itching and occasional chest pains?

Hello, I am 15 almost 16 year old male. I am over weight ( working on it ). Recently my mom took me to the dermatologist for mild acne and she prescribed me aczone and minocycline. I did a lot of reading on minocycline and understood its effects but decided seems as the dermatologist thought it was safe to go ahead and give it a try. I was on minocycline for 3 weeks when suddenly one day i broke out in hives and severe itching, automatically i umed it was from the medicine knowing that it had alot of side effects, also i looked up " minocycline itching" and found some people with similair problems. I took some benedryl had a long nap and woke up with no hives and no itching for the rest of the day. I called my dermatologist and she told me to stop taking it so i have been off the pill for about 3 days now i think. I am no longer getting any hives but i do still have constant itching, it occurs at different times and in different places throughout the day. the most commonly occuring places are: my legs, my back, my neck and head ( including itching on the scalp/hair area ) my arms, and it occurs sometimes on my hands but not to the same degree as other places. I am very concerned that even after 3 days of being off the pill that im still experiencing itching, i havnt told my parents im still having problems after being off the pill yet. Is it normal that im still experiencing itching? i used aveeno and bynadryl creme to stop the usual itching places but if im at school or away from my house sometimes its not easy to be able to apply it also, i dont want to have to apply itching creme for the rest of my life. On top of the scary thing is i am experiencing some chest pain/pressure. I know that i am over weight but im only 16 and i havnt ever had any chest pains before i started taking this medicine. its also strange that i had been taking minocycline for 3 weeks before any of this happend. I would think it was an allergic reaction but 3 weeks of minocycline for the reaction to take effect? i dont think that is the case, if anyone can help i am very concerned