Hi Jill and welcome to DWD. It's lovely to meet you!
Can I ask when you last saw your GP about how you are feeling and a meds review? Have you had the diagnosis of "depression" or have they ever explored other options for a diagnosis and help too? If you are having dramatic mood changes on your regular meds then I would really suggest you need to go back and talk to your Dr. You could try keeping a mood diary to take to show them too.
What kind of hobbies do you have? Have you thought about volunteering? It might give you a whole new group of people to make friends with as well as maybe giving you somewhere to go for Easter etc and something you could build on as and when you retire..