Slightly different experience here. I take 30mg daily for anxiety and depression. It took about a week for the initial side effects (tiredness, constant yawning and feeling a bit spaced out) to subside. I do feel nauseous for about an hour or two after taking my dose but gaviscon helps and it does pass. I take it in the morning as I can't sleep with the nausea, at least in the daytime I can distract myself.
I feel better now than I have done for months. I was becoming increasingly withdrawn and agoraphobic but am now able to go out alone. My friends and family have commented on how much better I seem and I'm preparing to go back to work, which felt impossible a few months ago.
I've taken lots of different anti depressants over the years (for anxiety as much as depression) including citalopram, fluoxetine and sertraline. I really struggled with heightened anxiety taking sertraline and struggled to come off citalopram but know others who've had good outcomes with these. I do think it's a case of finding the medication that suits you and balancing the therapeutic benefits with any side effects.
I know I'm just a stranger on the Internet, but please ignore pp advice to stop taking them, until you've spoken to your GP. SSRIs and SNRIs are well known for their withdrawal symptoms so shouldn't be stopped suddenly. Not everyone will experience difficult withdrawal, although some will and it's unpleasant to say the least. I don't know whether I'll be affected but right now the benefits outweigh the risks for me. I'm also taking the lowest dose (up to 120mg can be prescribed) on the understanding with my Dr that we start at the bottom and only take the minimum required to see an effect.
Hope this helps and you feel better soon.