How Can Anxiety And Insomnia Be Treated?

Hi, I am a 68 year old female, 15 year Medullary Thyroid Cancer survivor. Last year my Husband died in a horrendous automobile accident, and my Great Dane died a month ago (mourning)? I became distraught and off my Synthroid and all other meds, became a-thyroid and was showing up in ER s w/all kinds of problems. My Endocrinologist put the fear of God in me, then left me to work it out, but the fine tuning has been problematic; synthroid - afraid of cytomel (heart attack?). Accidentally woke up at twilight, took Synthroid 12 hours early. Have had sleeve gastrectomy, so induced vomiting, took alot of antacid, followed up with milk, OJ and food. Will 1/2 mg Clonapezam (Klonopin) help calm anxiety so I can sleep? Get back on regular schedule at 7AM? Thanks so much for any advice you can give on this, as I can see getting back on schedule will be grueling. Thank God I am retired! Thank you for any assistance you can give...Beverly S, Gainesville, FL.