HelpmecopeBP

I have been with my partner for past 14 years and during this time have discovered his Bipolar disorder. We have had a lot of ups and downs as is normal with this disease and always made it work somehow. 3 weeks ago he started taking Lithium, last Thursday they doubled his dosage and its been downhill ever since. He took the higher dose Thursday and immdiately withdrew from me, then Friday he went out to a bar and got drunk. I picked him up and on the way home he was ranting about some singer in there that was doing things wrong and not really making a lot of sense. Saturday came and he was talking with his sister and a friend of ours and said he was Scared I was going to break up with him, then went to the mall to buy me a valentines gift. Sunday rolls around and we were listening to Jennifer Hudson sing I will Always Love you on the Grammy awards and he burst into tears and blurted out that it was over and we had just grown apart. He thinks he is thinking so clearly that he finally has it all figured out. He is already out looking for an apartment and I just dont know what to do. Is this normal for people taking Lithium to experience this and how do I cope with all of this without letting him destroy us both in the process? I love him very much and just can not imagine losing what we have built together.