Sometimes shortness of breath (mainly when i'm nervous or stressing about something)
Sometimes unable to take a full breath.
Sometimes feel like i can't breathe but i am, so i don't know about that one..
Sometimes i feel like my lungs aren't as strong.(For example, i play saxophone and sometimes i'm unable to play as long as usual)

Although i'v had no pain, minimal coughing, and i'm sleeping fine. plus i can excercise (run 3 miles almost everyday)

What is this?

i'm sure you've considered asthma, but if u havn't mayb you should.
regardless of this you should go to the doctors, i know i sound like a mum but its better to be safe than sorry! x

i'm sorry to say….but you have AIDS. by your symptoms it can easily be seen that your HIV has rapidly developed into AIDS.