Different people react differently to different anti-depressants/anxiety drugs. For some, some side effects give troubles that for others aren't and issue. Talk to your doctor about other options available if you think that this particular drug is giving you unacceptable side effects.
Of course being worried about it not happenning will have a massive effect on things, i've been in similar situations myself. In my experience I found that talking with my partner about my headspace and the pressure that I was putting on myself helped ease the situation. Focus on the journey, not the destination.
