When I have trouble with thread shreading & have tried other options, I switch to a metallic needle & often times, it works. I also like Titanium needles but I always use a premium needle in my machines. We spend so much $$ on these machines but sometimes try & go on the cheap side for needles, thread etc. Never usually worth it, in the long run. Try a metallic needle, won't hurt to try one. I also make sure my machine is clean, especially in the bobbin area. Lint builds up in there so quickly or some small pieces of thread get caught up in there & causes nothing but headaches.
My sympathies with the loss of your husband. You certainly don't need other problems to add to your stress. Hope things work out & you can get back to some quality sewing.