so sorry about your pup. Its so hard when they go. He was on medication so you were doing something. 
there is so much support here. This site is full of wonderful and understanding people its a great place to come to.
we lost ours of 12 years this August, it is so hard. Hang in there, take your meds, and discuss with your doctor any concerns! It always helps me to visit here often, the support is so great 
I also lost my angel-pup last May. Still cry when I think of her. I'm glad your here with us, we'd love to see you on the monthly chat, the girls there are wonderful, and we'd love to hear about your awesome weight loss.