It sounds like it's gonna be a tough 7 or 8 months, and you sound worried. Which doesn't help, does it ?
I suspect that the best way around the medication-less days is to make them routine. Pregnancy can make the best of us moody, and it does put a strain on our entire system -- the brain and body are busy -- they are making a baby. Add anything else to that, and they don't seem to have the usual number of resources to cope with "stuff".
For starters, I would look at what I eat, and build a bunch of protein into the day. It takes proteins to build cells and keep our blood sugar at a healthy level (versus low) and to metabolize iron, which you will need in more abundance as you build news cells down there in your womb. from there try to be sure you eat well balanced meals. If you need assistance, you might be able to see a nutritionist, and your doc could recommend someone should you ask him/her.
Take a walk every day. Get some "me time" and exercise at the same time. It will help your circulation and help your brain, because when you exercise enough to get your heart rate up, your body releases adrenalin and some whatever-they-are-called, but they make you feel good about yourself and exercise helps to release tension, too. ahhhhh
If you have trouble sleeping, make a bedtime habit of doing stretching and relaxation exercises just before you turn in. Then relax. If you wake up during the night, try making a mental list of every good thing that happened the day before. No matter how small, the more positive things you can come up with (even if you have to force yourself), the more thankful you will become, and that may also put a smile on your face.
If you're able, bite your tongue as much as you can. It's hard to feel horrible on the inside, but if you can limit its effects on other people, you at least won't have lashed out at somoene and have something else to feel badly about.
Take each day as it comes, knowing that you are being very brave here. It's hard to go off medication that you depend upon daily, and it's a sacrifice you are making. You are wise and you are brave to "tough it out" through the pregnancy in order to have a healthy child. I wish you the very best as you tackle each day, and then even more of the best when you hold that new bundle in your arms, and see just how "worth it" it was to have struggled through the days of pregnancy.
Kudos to you, Mom !!