I've looked closer and it looks like there are two lumps, one below the other one on the front of my neck

The odds are the lump on your neck is absolutely nothing to be concerned about but you should probably see your GP and get it checked out if only for your own peace of mind.

I would think the other issues are also worth talking to a GP about. The odds are they aren't even related, but again, they are worth checking out, especially since with some of them, it is likely there will be something that can be done to help with them.

Thank you for your help

I will see if I can book an appointment - hopefully it is just nothing 

You don't mess around with lumps. The rule of thumb is, wait two weeks, see if it goes down. If it doesn't change or gets larger, you see about them. Hard painless, immovable lumps should always be checked by a GP rather than trying to obtain an answer over the net. Going by your picture, that looks a biggie. Anything over 2cm in the neck needs to be evaluated by a doctor in person.

Chances are it is nothing, but it's needing a qualified practitioner to tell you that. Most lumps appear due to infection (viral, bacterial etc). To be clear, it's probably nothing, but since you're here and already thinking "cancer", and so you do go to the gp, cancer itself doesn't tend to hurt. Cancer pain is almost always because it's pressing on a nerve, a structure, causing a blockage or stretching something which does have nerves. A lump being sore or tender is actually a positive thing.

Thank you for your response

I wanted to reach out on a forum first because I've never visited the GP before and I'm worried about wasting their time if it turns out to be nothing

It's interfering with your swallowing, you won't be wasting their time. It's always better being told it's nothing, than to sit on something that could be something. Doctors want to tell you it's nothing. Takes less time, and zero treatment required.

Are you able to move the lump at all? Or is it fixed to the skin or structures in your neck?

If you are have trouble swallowing, memory problems, breathlessness and feel tired all the time, you are definitely not wasting their time. Even without any of those issues, you would want to get the lump checked out but even without that, you have reasons you need to see a doctor.

That doesn't mean it's likely to be anything serious. The tiredness and forgetfulness could be something as simple as stress or if you'd had covid, it could be the result of that or it could be a thyroid problem or any of a number of things but you still don't need to suffer in silence.

If the lump is a thyroid nodules and is causing you to have trouble swallowing, it likely needs to be removed even if it's completely harmless (as it most likely is) and it could be that the other issues are caused by something very minor that the doctor will be able to treat easily.

If something is causing you problems, it's definitely worth seeing a doctor about. If it's nothing, it will be treated easily which is probably a lot of what doctor's do.

Thank you for your help, I really appreciate it

after tilting my head up towards the ceiling and taking a photo, I think I can see it is above my thyroid - it feels very solid like it's attached to my trachea- I can't move it 

Thank you, I will see if I can see a GP

I really appreciate your time and help :)

I'd say sorry for nagging, but I'm not sorry. You contacted your gp yet? I get the impression you're dithering, so here i am nagging you.