I also know what you're going through, and even now am going through it (bodily ailments, and multitude of problems).
From my own experience, you are feeling overburdened because you are placing trust in yourself. You must start generating good thoughts, always remember God and pray continually (without ceasing). If you do this, if will help you acquire faith in the Lord because remember in Luke 18?
NKJ Luke 18:1 "Then He spoke a parable to them, that men always ought to pray and not lose heart,
2 saying: "There was in a certain city a judge who did not fear God nor regard man.
3 "Now there was a widow in that city; and she came to him, saying,`Get justice for me from my adversary.'
4 "And he would not for a while; but afterward he said within himself,`Though I do not fear God nor regard man,
5 `yet because this widow troubles me I will avenge her, lest by her continual coming she weary me.'"
6 Then the Lord said, "Hear what the unjust judge said.
7 "And shall God not avenge His own elect who cry out day and night to Him, though He bears long with them?
8 "I tell you that He will avenge them speedily. Nevertheless, when the Son of Man comes, will He really find faith on the earth?"
(Luke 18:1-8 NKJ)
St Anthony the Great said, 16. "A brother said to Abba Anthony, "Pray for me." The old man said to him, " I will have no mercy upon you, nor will God have any, if you yourself do not make an effort and if you do not pray to God."
Also, listen to what St Paul says when he was threatened by imminent death and on the verge of despair:
8 "For we do not want you to be ignorant, brethren, of our trouble which came to us in Asia: that we were burdened beyond measure, above strength, so that we despaired even of life.
9 Yes, we had the sentence of death in ourselves, that we should not trust in ourselves but in God who raises the dead,
10 who delivered us from so great a death, and does1 deliver us; in whom we trust that He will still deliver us,
11 you also helping together in prayer for us, that thanks may be given by many persons on our behalf for the gift granted to us through many."
(2Corinthians 1:8-11 NKJ)
So we must trust in God, knowing also that faith without works is dead faith... Prayer is considered a work in the Church.
I hope that my poor advice will help you.
Lord have mercy.