SO sorry to see you here, joining our exclusive little club (that none of us wanted to join!) @Shelley_H .... but you are in the right spot for support & answers to questions from those who've gone before you.
As you say at the end .... try not to overthink it - as your medical team will be meeting to discuss your treatment options, once all your results are in. 'Guessing' will just cause unnecessary 'angst' ...
Try & keep busy doing stuff you LOVE doing in the mean time .... be it art & craft, cooking, other hobbies ... or even trying something new, to keep your brain busy & stop it going off on a tangent! This diagnosis mucks with your BRAIN even more than your body - so be kind to yourself & wishing you all the best.
Check out this post, for a bit of info on the forum & 'other things' you may like to check out (and even have a bit of a laugh, as we ALL need a laugh now & then!)
https://onlinenetwork.bcna.org.au/discussion/23477/a-big-welcome-to-all-our-new-members#latestTake care & thinking of you