Omeprazole and drinking water

I've been on Omeprazole for about 8 weeks now for acid reflux and for the last six weeks or so I've suffered from a very dry mouth (constantly drinking water!!), sore throat, occasional headaches and insomnia in that I'm finding it increasingly hard to get off to sleep. When I do get to sleep and I wake up I feel like death, my mouth, throat and nose feel like they're full of mucus that won't shift.

For the last week or so I've felt like my mouth and lips are swollen up - I've only just read the side effects on the leaflet with the tablets and several of my symptoms are listed on there so I'm thinking it's not psychological, has anyone else had a similar allergic-type reaction?

My GP has advised me to come off the Omeprazole when I finish my current box, but having read the side effects I'm coming off them tomorrow.