Hello Kat61,
I had the same worry, and it took me ages to see someone about it. When I did eventually see my GP, he sent me for tests and I found out that I have Alzheimer's Disease. But I am really glad that I did go to the doctor!
I am now on medication that makes me feel a lot better. I am making the best of my memory by always writing things down, usually on my phone. I have also been on a course with my partner, organised by the local medical centre for older people. That taught us what to expect, and made us realise that an Alz diagnosis is not the end of the world. I still have a driving licence after 2 years, though I admit that the annual driving tests are a bit scary!
Now I have joined this forum, of course, and it's very useful to hear of other peoples' experience. I have also met several other Alz people who live near me, so we patients and our carers can exchange information and support each other.
I think you'll find it better to see a doctor - if you do have dementia you will get a lot of help, and if you don't, well, you can have a party!
Best wishes, Martin