Back in December, the antidepressant I've been taking started to stop working. This is common among psych meds if you've been on them for a long time. It doesn't have anything to do with developing a tolerance; you just quit responding to them. They don't know why it happens. During the past several weeks, the symptoms have become more pronounced: anxiety, irritability, fatigue, and anhedonia (not caring about things you usually enjoy).
Last week I told my doctor about this, and we're now in the process of stepping down the old med and stepping up a new one. The stage we're in now is the most difficult one, in which there's not enough of the new med in you to have its beneficial effect but there is enough to create side effects (they go away as your body gets used to the new stuff). Right now I'm feeling dizzy on top of the rest of it.
I've been through this several times before, but we used to do it in the hospital where the doctor could see you every day and make adjustments quickly. Now there's no more hospital to go to--the private one shut down entirely and the psych unit of the general hospital has been phased out. So, it has to be done with everyday life going on. It will get better; it's just hard now.