Praying when you cannot get up
This is the most practical thing in the lesson. People stop praying entirely rather than pray badly, and that is a heavy price for a standard nobody set. The concession chain in the report below is in the text. Whether depression that has slowed you to a stop reaches the threshold it describes, and where exactly that threshold sits, is a fiqh question. Ask a scholar you trust, once, and take the answer.
Qur’an and Sunnah
لَا يُكَلِّفُ ٱللَّهُ نَفۡسًا إِلَّا وُسۡعَهَاۚ لَهَا مَا كَسَبَتۡ وَعَلَيۡهَا مَا ٱكۡتَسَبَتۡۗ رَبَّنَا لَا تُؤَاخِذۡنَآ إِن نَّسِينَآ أَوۡ أَخۡطَأۡنَاۚ رَبَّنَا وَلَا تَحۡمِلۡ عَلَيۡنَآ إِصۡرࣰ ا كَمَا حَمَلۡتَهُۥ عَلَى ٱلَّذِينَ مِن قَبۡلِنَاۚ رَبَّنَا وَلَا تُحَمِّلۡنَا مَا لَا طَاقَةَ لَنَا بِهِۦۖ وَٱعۡفُ عَنَّا وَٱغۡفِرۡ لَنَا وَٱرۡحَمۡنَآۚ أَنتَ مَوۡلَىٰنَا فَٱنصُرۡنَا عَلَى ٱلۡقَوۡمِ ٱلۡكَٰفِرِينَ
God does not burden any soul with more than it can bear: each gains whatever good it has done, and suffers its bad- ‘ Lord, do not take us to task if we forget or make mistakes. Lord, do not burden us as You burdened those before us. Lord, do not burden us with more than we have strength to bear. Pardon us, forgive us, and have mercy on us. You are our Protector, so help us against the disbelievers.’
Qur’an 2:286
لِيُنفِقۡ ذُو سَعَةࣲ مِّن سَعَتِهِۦۖ وَمَن قُدِرَ عَلَيۡهِ رِزۡقُهُۥ فَلۡيُنفِقۡ مِمَّآ ءَاتَىٰهُ ٱللَّهُۚ لَا يُكَلِّفُ ٱللَّهُ نَفۡسًا إِلَّا مَآ ءَاتَىٰهَاۚ سَيَجۡعَلُ ٱللَّهُ بَعۡدَ عُسۡرࣲ يُسۡرࣰ ا
and let the wealthy man spend according to his wealth. But let him whose provision is restricted spend according to what God has given him: God does not burden any soul with more than He has given it- after hardship, God will bring ease
Qur’an 65:7
Narrated `Imran bin Husain: I had piles, so I asked the Prophet (ﷺ) about the prayer. He said, "Pray while standing and if you can't, pray while sitting and if you cannot do even that, then pray Lying on your side
Sahih al-Bukhari 1117graded sound, sahihaynfull report
Translation: M.A.S. Abdel Haleem, The Qur'an, Oxford University Press, 2004.