I would suspect the hormones may be causing you some problems. When I get out of the ordinary feelings like nausea, or anything different I always check my meds. Do you have any other new meds? Look at your print out for side effects, or if your pharmacy doesn't give you a print out listing side effects, google it you may be able to read the side effects on this site. I once took Hormones and had horrible stomach cramps, and I was put on the hormone patch so it would not have to go through my stomach. I did have some problems with the patch, but the were mild. Taking oral hormones also made me nauseous while in the car. Just like you, I would often experience the nausea at odd times when I took the oral hormones - estrogen, and progestin. Right now I have a post in about the side effects for me of taking proton pump inhibitors for GERD and how they cause me so many side effects. I have been off Prilosec for one day, and my stomach is somewhat better, and I feel better in general. But when the heartburn and pain comes back, I will try to manage with Tums and antacids. Always, always look at your meds. when something new crops up. I nearly lost my hair from taking one medicine, until I figured what was going on. Good luck with your GP. I would change to one who does understand. I did that recently and I am very pleased. He is working on my problems - I have many, and it is going to take some time. You need an understanding doctor.
This maybe just stress. I felt like that before after being ill and sometimes still feel sick when you actually arent. I advice is too relax and enjoy stuff your into. Focus on work, family, hobbies. You will be good.