Welcome! Anxiety is very rough sometimes, especially with all of the very real physical symptoms that so many of us experience. It can really be frightening, not to mention, increasing our anxiety on top of that!
What kinds of treatments for anxiety have you sought? Have you tried therapy? Grief counselling? You say you've been on Zoloft since your husband's passing, have you had success with it? If you have, and you're noticing a spike in your anxiety, it may be time for a dosage adjustment, that is very common with these meds. Have a pow wow with your doc to see what you can do.
Hang in there...you're not alone! Also, I'm very sorry for your loss.
i honestly think it your paranoua and not to be mean but it also sounds like you got anxiety