بسم الله الرحمن الرحيم
Make qaza of one month salah which you missed. In-shaAllah, with the blessings of salah your depression and anxiety shall be removed. Also recite the following dua extensively to remove your mental depression:
لا حَوْلَ وَلا قُوَّةَ إلا بِاللهِ الْعَلِيِّ الْعَظِيم
May Almighty Allah grant you peace and ease and save you from all kinds of troubles! Amen!
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.