Hello Reba,
i do understand what you are talking about. i have been there more than once.
the only way to deal with those feelings is one day at a time talking to Yahweh The Almighty Who loves us so much that HE gave His only begotten Son Yahshua the Messiah to be our Saviour and Friend Who sticks closer than a brother.
Our Saviour taught us in His Word to pray to His Father and ours and ask in His name, what we need , because He will supply , He is our Provider,
Talk to Him daily, all day long , you may ask how can you pray without ceasing like the scriptures say,; well it is more like a constant thought pattern, always keeping your mind stayed on Him, Make Him your best Friend, tell Him what ever is on your mind, tell Him what you are doing, and how you are feeling,
Even when you feel the worst , still talk to Him, tell Him exactly how you feel, and remember that there was a time that even our Saviour asked His Father to be saved the pain and agony that He was about to face, but He loved us so much He was willing to go through it anyway,
Trust me He understands when we beg Him to kill us, to let us die, i know because i have been there, and talking to Him helped me through it all everytime, i used to feel totally useless, and very unwanted, i used to beg Him to kill me and get me out of my misery, or at other times when i was near death from being sick, i would beg Him to just let me die,
But He didn't , and i couldn't bring myself to kill myself because i knew that i can't ask Him to forgive me for doing a murder before i do it and expect to be forgiven, and if i killed myself i couldn't ask for forgiveness afterwards. So that is why i wanted Him to kill me or just let me die.
But see He has a plan and purpose for each and every one of us , even though we can't see it or understand it.
So please, talk to Him, He is the only one Who will always be there for you ! !