Rach I feel you'll find the psychiatrist helpful I really do and even more so if it's combined with a change in medication. It seems as though the answer so far has been to just keep uping the dosage of a medication that doesn't seem to be the right one for you. It seems like you're getting the effects from it that you don't want - tiredness and memory loss are side effects of what you're on - but none of the positive effects. I don't know if you're aware but among the other side effects are flu like symptoms and dizziness both of which you've experienced recently. All these negative side effects just go to making you feel even more crap and so it sems like a vicious circle. The more they increase the dose to make you feel better the more the negative symptoms increase making you feel worse. I'm almost positive that with the right medication you'd find yourself coping far better than you are.
Regarding the arguing well out of the list of top stressful things you've not done too badly at having your share so far this year. A new baby and two house moves in a short space of time would have anyone stressed out with or without depression so arguments are par for the course really. But you have a good man in N who I'm sure is so worried and concerned about you. As much as he may be rowing with you he's also aware that this isn't really you and probably just wants his Rachael back.
How soon before you see the psychiatrist? If you have to wait a while then maybe speak to the doc about changing your medication. A lot of what you're describing is depression but at the same time it's also negative side effects of the medication and so your head must be so messed up with a combination of the two.

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Vodka - cheaper than botox and paralyses more muscles
Who the hell invented hormones anyway?
Warning - chocolate can make your clothes shrink