I'd have to say that yes it is a normal part of the disease. I'll also add that there are other things that you can do, though extremely difficult to start, beyond meds that may improve the depression.

Man times people are depressed without there being a chemical component so the med changes will have no impact, but things like eating right, socializing, exercise, and doing special things for yourself can have a great impact on mood.

Getting sleep on a regular schedule has helped me through ups and downs.

I have struggled with the depressive side. I'm usually more on the depressive side. I know sometimes it is impossible to have any motivation to do anthing beyond exist but the possibilities are there.

One thing that I have found that doesn't take much energy, just a bit of remebering to do it, is take a daily multivitamin. After a couple of weeks consistent I do see an improvement. Sometimes enough to get myself to work on the other things.

I, too have been on the same meds beause they have been effective. I do change doses often becaus this is a cycling disorder. But it does not have to own us.

I know this may not resonate with you because you are in the midst of depression, but if you can see it on a good day maybe you can move onto more good hours.

Hugs to you.