Can't cope with nausea - HG?

I'm 7 weeks today and since 5 weeks have had the most crippling, intense 24hr nausea. It never lets up. I've been off work all week and can't see me able to go back next week as I can barely get out of bed. I've spent hours on Google and Glow looking for suggestions. I'm in the UK so can't try unisom but have had cyclizine prescribed - didn't work - and I've had promethazine prescribed - made me feel worse, if anything. I've tried all the usual ginger and peppermint tricks. I've tried vitamin B6. I try eating little and often but really really struggle to get anything down without gagging so I have lost weight. I have yet to actually throw up but gag and dry heave constantly, even drinking water. I'm weak and tired. I tried moving from the bed to the couch today and had to come back up within half an hour as I felt so ill. I'm not sure if this is normal. If this was normal morning sickness I would have had at least some relief from the things I've tried surely? Should I prepare myself for things to get worse and wander into HG territory? I'm struggling to cope - this is a much longed for baby following a year of TTC and a miscarriage but I can't live any kind of normal life like this and spend most of the day in tears begging for it to go away. My husband and I wanted 3 kids but I just can't go through this again which is heartbreaking 💔