During the period of covid recovery your body was subjected to a lot of stress.,thereby your vitamins and nutrients got depleted at a faster rate. Now you need to replenish those stores. Take tab  neurobion forte once daily after lunch , this helps you to fight the weakness with a full inclusion of  vitamin b complex For vit D deficiency you can start using drise t as blot twice daily after food ,better with milk. Exposure to adequate amount of sunlight for about half an hour,taking sips of ORS  frequently will help you get back the energy levels,by correcting the electrolyte imbalance. Start your d as y with warm u pl sne brisk walking for about 1to2 kilo meters in 20 min opens up your blood capillaries. Add eggs to your diet 1 or 2 eggs per day ,as egg is a whole some protein . Fruits and vegetables , those which are more dark coloured like the greens,bright coloured fruits etc csn give you required amount of anti oxidants.

Take b12 containing food like egg and meat N expose to sunlight for but D If it still doesn't improve then go for medication Multivitamin and vit. D tablets

You have vitamin deficiency So use Tab neurobion  and tab vit d3 60k And take proper high protein and fiber diet Drink more water

Nothing to worry...just eat healthy diet .eat more nutritious food...meat will help a lot...plenty of water..this will help..do have a consultation if u r not satisfied