I can give you some suggestions, though I cannot treat or examine you and cannot replace your local medical care. Lithium is a mood stabilizer. There are multiple other mood stabilizers in different classes: anticonvulsants (working to prevent the rapid neurologic/electrical shifting of mood) and atypical antipsychotics (working for mood, not psychosis).
In the first group are (with US trade names and some of the other reasons they might be selected for use for patients Olanzapine (Zyprexa),for people with severe or psychotic depression, which often is accompanied by a break with reality, hallucinations, or delusions7
(Please wait for further--I have some good suggestions but just got called away--back in about two hours.)
I'm sorry--the above are the second group, the atypicals, not the anticonvulsants. The side effects of the atypicals can be weight gain and worsening of diabetes.
The best, XXXXX XXXXX of the anticonvulsants (seizure medicines) is Lamictal, which is available in the UK: http://www.nhs.uk/medicine-guides/pages/MedicineOverview.aspx?condition=Epilepsy&medicine=Lamictal
I prefer to consider drugs while trying non-drug therapy like neuro- or bio-feedback, which can be quite effective and retrains your brain without giving you radiation or putting electrical impulses IN, like electroshock therapy, but only takes a recording of your brain activity and gets YOU to straighten it out.
Please ask any questions and again--I apologize for the slightly messy arrangement of facts above. I wanted to finish my thoughts of help for you while not neglecting my tasks here!
Please ask any questions you wish to. There are lots of options to find the best solution for you.