I did plenty of sofa parenting, don't feel guilty about it. I am just coming out the worst of the nausea (I hope) at 18 weeks now (started at 3 weeks!), and I spent the entire 6 week summer holiday indoors, so felt ridiculously guilty for just being a sick mum all the time 
Because of the whole thalidomide scandal, no one wants to recommend anything to pregnant ladies anymore, and there's no proper testing or extensive research done, but it's to the point even paracetamol instructions say avoid during pregnancy!
Hope your midwife can fight your corner for you. The only things I found helped this time round were:
High dose of B6 (3 x 25mg per day)
Drinking lots of water
Having peppermint tea
Polos to suck
Forcing food down small amounts and regularly - never let your stomach be empty (with DC2 I hardly ate at all for 4 months - this time I forced food down and although nausea didn't go away, nausea is much much worse on an empty stomach)
Eating before you get up
But I spent most of the time on sofa/in bed, crying, feeling depressed and confused over not wanting to carry on. Feels like permanent flu symptoms. It gets lonely 
By the time I saw my midwife, all she said was, 'if you're really really struggling, we could try cyclizine' but it wasn't in an encouraging way, and I felt I'd got so far and was hoping the nausea was going to lift soon enough (which it didn't - the 12 weeks is BS).
There's a great HG forum on here, and lots of ladies I'm sure will have great advice for you x