I will pray for you. In the meantime, stay in prayer as you have been.
You didn’t mention how long the negative thoughts have been with you, but perhaps you could make an appointment with a doctor who could refer you to get the care you need? It may also be helpful to talk with a priest at your parish. I have done this probably 5 times in the last year!
I believe it’s very important to have people/friends you can talk to. Are you in any activities or involved in church bible study or other ministries?
I go through a few days each month where I feel hopeless, down, and suicidal. During those times, I pray harder; as I know this will pass.
I am by no means an expert, but I have found the more I can change my focus and stay involved in ministries and serve others, the better I feel.
I know this is a horrible way to feel, but do know that there is help available! God loves you and He wants you to value your life as He does!
God bless you! Please keep us posted on how you are doing. Peace and all good!