If it's thyroid cancer you are worried about, I've had that and can offer some reassurance. Firstly, thryoid nodules/cysts on the thyroid gland are incredibly common, like 25%-50% of people probably have them and it might even be more. The vast majority are completely harmless and benign. Only something like 5% are cancerous.

And even if it is thryoid cancer, which it probably isn't, it's not what you might be expecting when you hear "cancer". For a start, the most common forms of thyroid cancer have survival rates so high that the term "survival rate" sounds pretty ridiculous. I think among younger people (under about 50), the most common form has a survival rate over 99%. And they rarely use chemotherapy or radiotherapy. Worst case scenario is the removal of your thyroid and some lymph nodes, which...really isn't any worse than I would imagine having say your appendix removed would be.

I had my thyroid and 57 lymph nodes removed in January 2020. I was back at work a month later and that was that. I did have to have radioiodine treatment later on, but that is a one-off and really just a nuisance. It's just a matter of swallowing a capsule and the worst part of it is that you have to isolate for a while afterwards because you are radioactive. The only side effect I had there was a nose bleed about 10 days afterwards.

It doesn't usually cause any symptoms either. A nodule on your thyroid, whether benign or cancerous probably could cause shortness of breath, if it was pressing on your windpipe or something. I think that could happen either way. Or it could be complete coincidence or a result of the stress.

Best of luck with the ultrasound and don't worry if they want a biopsy. The ultrasounds are often inconclusive.

Just an update, still awaiting my scan calling the doctors tomorrow to see where they're at with it lumps got a little bigger starting to feel it now in my neck constantly on my mind can't sleep at all up till 4 In the morning most nights absolutely petrified! So scared so so scared I don't know what to do. Im going to see if I can get an appointment tomorrow for my doctor to have another feel as of now it's a lump on the front of my neck quite hard but movable, can be tender hurts with exercise also inflames with exercise. Don't have any other symptoms other then that. When im just having a normal day I can barley notice it, other then the tight feeling in neck. Had blood work results back white blood cells were higher .2 over then what it should be however red blood cell count normal. Signs of infection in body but don't know where. Lymph nodes have gone down in neck however the lump still persists. Help please can someone advise me. A little bit of ear ache.