I was vaccinated with covisheild 10days back now iam experiencing headache tiredness fatigue and muscle aches at back and i tested negative for covid 19......is that possible and whats the reason for it pls tell me?

Headache, tiredness, fatigue and muscle aches at back are all non specific symptoms that can be caused by such varied things as dehydration, overexertion, heat, and other infections. A full exam can help determine if you have another infection such as strep throat, cellulitis, cold/flu, Mono, or any of various other infection. Get plenty of rest, use paracetamol for headache, and drink lots.