A month isn't long enough to see if going on lithium helps and 2 days isn't enough to see a change from going off of it either.

You need to take a medication for 6-12 weeks before noticing an improvement. When I had a reduction it took about 2 months until I noticed the reaction to having done so.

Please, continue to take the medication until you have discussed this with your doctor. At the very least talk to your pharmacist. Thank you.