i'm 15. about 3 weeks ago, i got tonsilitis and a bad chest infection. its all okay now, except for the fact that i still have swollen lymph nodes in my neck. initally, i knew that it was just from the tonsilitis and that it would go away eventually, but i've have a lot of other symptoms, mostly leading to non-hodgkin lymphoma and i don't know if i'm looking too deep into it or if i should do something about it. 

the symptoms that i've had over the past couple of weeks:

-left sides of body hurts ~ i was lying down and suddenly my whole left sides started hurting and it was uncomfortable to move or breathe

-something between my hip and left thigh hurt a lot

-right side of my belly was burning inside

-hard to breathe and my stomach feels tight ~ its like this every night now, not only when i'm lying down but even when i sit own or stand. it's especially during the night but it happens through the day sometimes

- random sweating or feeling hot at night time when it isnt hot

-lower left belly hurts

-hard to breathe at night, when i do both lower abdomens or belly or whatever is there feels uncomfortable and/or tight

RECENTLY (in the last week or few days)

-right armpit hurts

-right arm aches a lot

-slight chest pain and it doesnt stay for long but it happens

i hope i'm not overthinking it but please give me some advice since i'm only 15 and my parents dont think its anything. ive went to the gp about it and theyve said it shouldnt be anything to worry about but im still worried because i feel like its something worse