Cant feel any emotion after takin nexito

Hi, I was put on a tablet called nexito and a tablet called metpred for travel headaches i had lately in july. I was taking them for around 2 months till ene of august and stopped. Later now i feel i cant feel anything emotionally. No motivation and dont like things that i liked in the past. Basically i feel like i don wanna do anything and don feel pain or pleasure or any other emotion. Just flat. Also have an headache quite new that starts from upper throat and radiates till center of head. Have lost the appetite and liking for certain foods. Feel a bit nauseous at times. Also lost my attachment to everyone around me. I feel so calm without any thoughts. Like some switch was switched off which was onn. Was perfectly alright before this. Took an mri last week and results came normal. Can you pls suggest what might be the problem.