T.R.
Wow, sounds like you have had a lot of stress the past few days, so sorry. Let me just get right to the point - you need to get in to see a doctor now.
There are a lot of symptoms, and questions resulting from them, that we really can't speak to on this board. Many of your symptoms can point to pregnancy, but realistically that is not what is happening. There is a difference between whether it is -possible- you are pregnant, which you could be since you still have your uterus & have not gone through menopause, and whether it is -likely- you are pregnant, which you probably are not, since both you & your partner have taken measures to prevent this.
However, just because certain symptoms occur when pregnant, doesn't mean that they couldn't also point to another, different condition. You may be going through signs of perimenopause, other hormonal imbalances, or tumor growths (which can cause symptoms even when benign).
So the best advice any of us can give you on this board is to make an appointment to see your doctor. Let them know the symptoms have escalated in the past few days, & make sure you get a full work-up done.
In the meantime, for your own peace of mind, you can take another HPT. I've heard the ones @ the Dollar stores are highly regarded & quite accurate.
Best of luck to you, hope you are feeling better soon! T. :)