Defnotyummymummy - I had the same problem wiht my second child. My son had mild colic, but my darling daughter, now 15 weeks had the most horrendous colic (all day and all night) from 3 weeks old until 12 weeks when it just stopped.
Here's what we did:
Infacol and gripe water - rubbish
Cammomile tea - great! (Just dip tea bag in boiled water then let cool - it sent our little oneto sleep immediately.)
Coleif - get from your gp on prescription, BRILLIANT! it;s an enzyme you put into milk, bit tricky with breasfeeding but we expressed and put milk in a teat with 4 drops then carried on breastfeeding.
My healthvisitor and a freind recommended s/cr osteopathy and it is the best thing ever. Not sure wher eyou are located, but if you can get to Clerkenwell in London there is the fantastic Children's Osteopathy centre. You pay what you can afford adn they worked magic on baby girl. Ok, she still was colicky at night, but much less so and the colic in the day stopped completeley.
Contact them on 0207 490 5510
or look at their website www.fpo.org.uk
Also, we found sitting her upright in a baby bjorn 123 chair brilliant. They're nto cheap but so worth the money for her sake and ours!
It WILL stop,(litterally our baby just stopped crying one day - blissful!!) as your baby's digestive system matures it decreases. But I totally understand your frustration. Your baby does not hate you! Don't blame yourself hon, it's stressful enough having a new baby and seeing your baby in distress and coping with constant crying is very trying for anyone. If you want to have a chat about this, CAT me.