Hey there, we also have an anticipatory anxiety thread I will pull to the top for you.
Take care and good advice from the others.
Yep, I get the same thoughts when I am in a negative cycle..I stay in the moment by immersing myself in books, films, cooking, visiting with friends..whatever gives me joy.
I also find it grounding to touch things; flowers, cats, dogs, planting herbs, walking barefoot. Staying tactile with your environment is a great way to stay in "the here and now". I wish you all the best and hope this cycle ends soon. It sounds to me like you have a very positive mind-set and I have no doubt you will get through this and teach us all many things!! I look forward to getting to know you better.