I don't think anyone comes out the other side of treatment for cancer feeling great and with a zest for life. I felt like I was walking around in one of those weighted diving suits at first.
But, like you I did not want to keep feeling this way so I started to look for what made ME feel better. Some days were easier than others. It was very hard not just to sit there and cry sometimes (especially just after I finished radio and I could not wear a bra and prosthesis). They say that as a rough guide it takes about as long as you had treatment to return to your 'new normal'. So if you had 12 months of treatment expect to take 12 months to recover. For me I think it took a little longer than this. Everyone is different but I know even now that if I don't work hard at doing the things that keep me feeling good I go down hill really quickly.
I think getting help with recovery is a good idea. I had help with how I was feeling, lots of help to get moving exercise wise, help with sorting out what to include in my diet. It is very hard if you try to do it all yourself. I figured that I had lost the best part of a year to treatment and I just wanted my life back, so that spurred me on to get help and recover as best as I could, one step at a time. I really hope that you can find a way to start feeling better about things soon. You deserve to feel as good as possible. There is a very good blog post on here by Mich called what helps you when you're feeling down or depressed (something like that). Reading other people's ideas might help. Take care. Deanne xxxxoooo