Dear OP, I had a termination two and half years ago, pretty much for the same reasons you had yours. I had two children already and fell pregnant when the second one was ten months. I was psychologically and physically exhausted at the time and couldn't bear the to go through another pregnancy. Plus we were living in a one bedroom flat that we couldn't sell due to structural problems.
Both my DH and I were under a lot of stress and coping just about with two, it would have broken us to have to go through all the exhaustion and stress of another baby.
We were both 100% sure we didn't want another child so I had a termination.
It was very hard afterwards, though a part of me felt a great sense of relief, and you have to allow yourself to grieve, and to go through a period of mourning, like with any other loss.
I didn't go to counseling or therapy about it, but the whole episode exacerbated my anxiety and sleeplessness.
It will always be something that I will have to live with and cope with somehow. I was always pro abortion, as I think bringing a life into the world is an extremely serious decision, and it has to be done when you're sure about it, happy and in a financially and emotionally stable relationship, when you feel physically and psychologically strong.
I couldn't offer any of this at the time, unlike with my previous two children, so I was sure I couldn't go through it.
The way I think about it is that sometimes women have miscarriages because their bodies are telling them there's something wrong and the pregnancy cannot continue. Sometimes it's your mind telling you you cannot cope with the strain of pregnancy and raising another child. You have to listen to that, and respect it.
It will not make the grieving period any easier, but at least it will give you some perspective that what you did, hard as it was, was what you needed to do at the time for your own sake and the sake of your family, and even for the sake of not bringing another life to a world that was not ready for them.
Big hugs to you