You are right @"cranky granny" the side effects of treatment definitely include these mood swings. You are also right in telling yourself it will pass. After a while I could see the pattern of down and then the up times. It does get better again. Glad you went for a walk. This always helped me too.
I think many of us are used to being the strong ones, the one who is there for everyone else when needed. But this is just a short time in your life where you need to let others help you. I found it helped my family to cope if I let them help. So in a way you are still doing something to help them by letting them help you, if this makes sense?
I am over 3 years down the track now and life has settled back into a slightly different but very comfortable place again. That will happen for you too. One step, one day at a time and things get better again. Take care and come and 'talk' on here as much as you need to. It helps. Deanne xxx