Hey,
I am reaaly sorry to hear the problem faced by you but you need to explain a bit about your history,like from when are you experiencing fever,headache,backpain.
I will ask you some questions to prescribe you safe medicines.
For meanwhile have tab dolo 650 mg for fever.
Rest contact me asap.
Next Steps
take rest as I can see you are IT proffesional working on laptops may strain your eyes and result in headache. so try to take rest.