They don't go away without help. Once you have the baby ask the GP for some ointment to make them shrink and go away, proctosedyl is v good. Don't worry you will not have a bunch of grapes sticking out your arse for ever
Mine were not too bad in pregnancy, nothing a tube of xyloproct could not ease. After birth was another matter entirely. Pain was horrendous, worse than birth. But now, 7 weeks later, all gone. Actually was pain free after 2 weeks. Good luck!
The best creams tend to be prescription only, my GP prescibed proctosedyl and it has really helped with the swelling and pain, they are still there but not bothering me. I can only imagine they are going to get worse before they get better with all the pushing during giving birth. I was given a great cream called scheriproct after having my daughter 4 years ago that soon made them disappear but it is not suitable for use in pregnancy. You can buy over the counter creams like anusol and germoloids but I found them pretty useless.