I'm just looking for a little advice/reassurance or similar experience....

I've had a swollen lymph node about half way down the left side of my neck for approx 10 days. I spoke to my Dr already who told to me call back after about 3 weeks if it hadn't gone or sooner if it gets bigger. Its not changed at all, I wouldn't say it's very big - about 1/1.5cm - but I can notice it in the mirror so it's stressing me out every time I see it. The Dr asked if I'd been ill recently which I don't think I have, I mentioned my throat felt swollen but that was literally for a day and seemed more linked to the whole swollen gland thing than a separate bug. I had my first covid vaccine 6 days before I noticed it so I did wonder if that could have anything to do with it? I don't have any other suspicious symptoms as far as I can tell... it just aches down that side of my neck sightly. Doesn't feel right. I've had a small cyst that burst that side of my head that's not healed and my throat has been a bit red and not sure if I might have had an infection from taking my asthma inhalers.

I'm so fed up of feeling stressed, it's been a tough time recently and my Dr wanted me to visit A&E because I felt breathless and exhausted but they couldn't find anything wrong on X-ray/ECG/blood tests and told me it could be anxiety. I know I do worry and stress a lot so I'm wondering if it could just be that. I don't want to make myself ill. Would anything sinister have shown up on the tests they did last month ish? 

Sorry it's a long read and mostly me just needing someone to vent to about all the things going round in my head. I keep telling myself I'm most likely fine and sound ridiculous. I had two glands behind my ear swell up and that worried me so much but they went away after about 3 weeks...again I didn't feel ill or anything then and my Dr wasnt worried. 

EURGHHH...thanks for reading xx