i'm not sure if you are still interested in pursuing a pharmacological route but SSRI's are some of the least effective anti-depressants available today. many meta-reviews have pegged them as not better in a statistically significant way than the placebo.

if you're willing to still give it a shot, see if your doctor is willing to prescribe tricyclic antidepressants or MAO-I's. mao-i's in particular are very effective but come with some dietary restrictions (certain cheese and fermented foods are off the table).