I just saw this post as well as th eone I just responded too and I can totally relate so a good scripturre to read or say over yourself is Psalm 91 and alsoput on the Armor of God, not trying to be preachy or throwing scripture but it may bring comfort for the way you are feeling.
I understand what you mean about praying for so long and it seems like nothing is happening, I always try to imagine how much worse it would be if I or nobody was praying, I know that dont seem very uplifting, I just have been through so much that well intentioned people try to give advice but dont really understand what you have been through so I am not trying to come and say all will turn out exactly as you are praying I am just reaching out to let you know I totally understand the part about praying for 20 years and then some, sometimes it helps to talk to a friend or just vent to someone also and dont stop praying, I hope this did not upset you in anyway, I dont usually respond on here but I just got on to read my email and saw your post, I have no idea who or where you are and I dont know your situation but just wanted to let you know someone cares and Keep your head up as much as possible in these crazy Covid times.
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