Hi Vicky and ((((((hugs))))))
From my experience how you're feeling at the moment is perfectly natural. The worry and stress alone is enough to send anyone into a spin
Right now, do what you want to do - if you don't feel up to socialising then don't, stay home and do something you enjoy doing, something that you know will help relax you and take your mind off things for a while. Look after you.
Cognitive issues affect me and some days are definitely worse than others. Being completely and utterly knackered (which I am the vast majority of time) makes me worse, as does stress and at the moment work is a struggle too. Even under normal circumstances my job is very stressful - unfortunately this time of year is even worse.
I don't know what you do for a living but there are always little things that you can put into place to help you at work. If like me you forget things and get confused then use everything at your disposal - post it notes, diaries, calendars, make lists for yourself and prioritise your workload. Anything that will help. A large part of my day is working with figures and client funds, hopping from one task to another and (lol) planning ahead so anything that could make my day a little easier - I try out. Every little helps as they say. I do the same at home too.
Once you have a firm diagnosis that alone will take some of the pressure off partly because you'll at least then know what you're dealing with, at the moment it's an uncertainty which I think is far far worse
You have a lot on your plate so go easy on yourself. If your symptoms are proving really troublesome then speak with your neuro, even without a dx he may be able to prescribe meds to help.