I've been on Lithium for 12 years. I've had my struggles with it. Here is what I have found: (These are strictly personal experience, no one reacts the same.)

When taking it, I have to take it with protein. Not just food, but protein. Protein takes longer to digest. If not, I will throw it back up.

Set times to take it and be consistent. I have found that if I don't, that's when the side effects hit me.

Regular blood work is important to monitor lithium serum levels.

Monitor your sodium intake and how much water you drink. Both play a factor in dehydration which can cause levels to spike.

It can take 6-8 weeks to reach and maintain a stable dose. Give it time to see full effects.

I am sorry your wife is not supportive. No one wants to take these drugs. But we all want to be healthy and sometimes the meds are needed to help us obtain that health.

Good luck!