Pain in the upper back kidney area.

Had covid19 in August 2021, completely recovered with out any issues. Resumed normal pre covid activities for the last 30 days with 5 km walking , yoga, attending to gardening etc. Had diogonised with cardiac ischemia with multiple blocks in all important vessels  2003. Opted for life style change as per Dr Dean Ornish program and leading a normal active life for the past 18 years. At that time weighting about 95 kg which was down to 70 kg in 6 months. But post covid i am having pain on the upper back kidney position especially when i lie down or get up from the bed. KFT/ LFT normal. Urine output normal. The pain disappears after walking etc. I take at least 3 to 4 litres of water daily.  I also take 4 cloves of crushed garlic & a concoction of ginger, pepper tulasi lemon tea with honey in empty stomach for more than 4 years. I had also constipation post covid which is being resolved with dietary management. Had a complete blood / urine test and all vital parameters BP HR Normal.