"70 yrs old. have suffered from depression-bipolar since 17. have been treated with tens of medications to no avail, except lithium for 43 yrs which no longer works. 4 yrs ago i was treated with gabapentin, which seemed to decrease the depression already after initial dose of 300mg. increased to 3*300mg to which i reacted well until general anaesthetic in dec 2015 for operation threw me into a deep depression. any info on effect of anaesthetic on depression and any antidote?"