It's emotionally and physically up to you if you want to keep trying. I can say that after going through over 14 years of infertility treatments and 7 m/c's I'm 36 and I suppose I'm a bit stubborn but haven't given up. I feel that one day it will happen and we will actually have our first child hopefully before too long.
I'm sorry for your losses and know how you are feeling.
I went through 5 miscarriages before I ever carried my first child. To say the least all odds were against me. But God controls life and death! Be patient and faint not. What is for you will be at the time appointed. Just have patience and what you desire will be given when the time is right. In ans to your question sometimes your count will increase before decreasing just because of the hormonal changes that your body is undergoing. Yes this is common. But once the sac begins to detatch and breakdown in the form of clots then eventually your count will come down. It is a slow process but it begins to decrease with time. This also happend to me and I had to research it for myself because most people had never heard of it. I never fall in the"Norm" category. Hope this hepls you.
Don't give up; it only takes one good egg & one time for it to work! Some people have to go through a lot but most people who really want a child do get their baby eventually. Take care.
Hang in there.
You're doing the right thing by not giving up. I haven't had a MC before but friends have. I think there is a point in trying. God will help you, put it in his hands, Good luck and be patient. It'll happen for sure. You may want to look into counseling, it can help you cope