Tezhughes05.  Welcome to the forum.

We're not doctors here and we can't give a diagnosis.

As [@helenk74]‍ says, this might simply be an infection. Sometimes a lymph node doesn't go down after the infection is cleared and remains harmlessly swollen. 

I would hope that since you've had this for 18 months already, if it was anything too serious it would have blown up by now.  You're not showing the classic lymphoma symptom of drenching night sweats, and there are a number of possible reasons for the other symptoms you mention.  However, you won't begin to get better until you see your GP, and you really should go soon.

I know you're worried about cancer otherwise  you wouldn't be posting here, but ignoring a possible cancer is never a good idea.  I'm not aware of any cancer than just goes away because you don't see the doctor, and in delaying then you're running a risk of it getting much worse.  So please control your fears long enough to see your GP and get yourself checked out. 

Please let us know how you get on.  Your feedback helps us improve our answers for other people.

Tezhughes05.  Welcome to the forum.

We're not doctors here and we can't give a diagnosis.

As [@helenk74]‍ says, this might simply be an infection. Sometimes a lymph node doesn't go down after the infection is cleared and remains harmlessly swollen. 

I would hope that since you've had this for 18 months already, if it was anything too serious it would have blown up by now.  You're not showing the classic lymphoma symptom of drenching night sweats, and there are a number of possible reasons for the other symptoms you mention.  However, you won't begin to get better until you see your GP, and you really should go soon.

I know you're worried about cancer otherwise  you wouldn't be posting here, but ignoring a possible cancer is never a good idea.  I'm not aware of any cancer than just goes away because you don't see the doctor, and in delaying then you're running a risk of it getting much worse.  So please control your fears long enough to see your GP and get yourself checked out. 

Please let us know how you get on.  Your feedback helps us improve our answers for other people.