I'd say go now. It sounds like you'll only be worrying about it until you do. The sooner you go, the sooner you get an answer.

The general rule with swollen lymph nodes is, leave it 2 weeks and see if they go down. Unless of course it gets a lot larger.

Marycontrary

Hi just read your post about your small  pea sizes lump on your  left collar bone. The fact that you've posted on here for some advice,tells me it's obviously worrying you,which is understandable.  My advice to you is to call your doctors and get an appointment, it may be something or nothing to worry about  ,but you won't know unless you go to see your doctor,and if thry think you need it checked out,they will  refer you to relevant consultants,and at least then it would put your mind at rest and if it did turn out to be of any concern tge sooner its dealt with  the quicker it's seen  the outcome would be better. 

You say you feel that doctors think you are a hypochondriac , but how could they think that  as you've said yourself in this post,that you hardly ever go to the doctors.  And you have stated that you have mental health issues,so maybe it's just your imagination running away with you,and it's only you that is thinking that.  

The sooner you take the first step and call your doctors to discuss your findings and worries,the better the outcome  as I said you are involved worrird  about the lump,and it may turn out to be nothing to worry about.Go make that much needed call , you will feel.so much better when  you  do.