Hi, Blue summers, Sorry to hear that things are so yucky right now. It sounds like you are right about the depression and it sounds like you've gota dose of anxiety to go with it. Sometimes, when we are depressed, we start to worry as well and that triggers the anxiety, which can sort of float around like a lost duckling looking for something to attach itself to. The brain doesn't like to have feelings that it can't explain, see. Since anxiety usually has to do with threat of pain or bodily harm, attaching it to thoughts of death is really easy. after a while, you'll start feeling the worry and the thoughts will come up almost simultaneously. It would be almost impossible to tell what came first, the chicken or the egg. And depressed people think of death a lot.
My suggestion is simply if you can, get up and take a walk, get out and try to fit some motion in. Moderate excersize is really good for anxiety, as well as therapy. As soon as you start worrying, take a walk, or maybe even take a course in tai chi so you can try that when you start to worry. It will have the added benefit in giving you something that can help you turn towards life. And also, it might be good to remind yourself that death is not waiting to sneak up on you. Death is only a slave of injury to your body. It is there to help you only when nothing else at all can. It is NOT an escape route OR an enemy. Not so scary.
Talk to your therapist or GP, but try these other things too in the meantime. I hope they help. HUGGGSSSS