It sounds to me as though your meds are not working properly. If you're still having "big" problems with anger and constant tiredness and depression, something is certainly wrong. While the odd problems with depression, and weakness happen, this should not be constant.
I think consulting your physician can ease your suffering. It just makes sense that if the meds are supposed to relieve these issues, and you are still experiencing the same problems, that something is off track.
Hope you find a solution for this Gaz
Be sure to let us know how it works out
Good judgement comes from experience and alot of that comes from bad judgement.