Facing cold since a month. To it.

I have been constantly feeling sick since last few weeks. Often I suddenly feel cold in my legs and arms and then it develops into a runny nose or I start sneezing. The feeling cold is not like a normal wintery day kind but more like a sick feeling.  I also seem to almost never get a high temperature fever anymore since a few years, it's always the body is cold on the outside and warm sick feeling inside that any other person can't figure that I'm having a fever and feeling cold. Earlier this would happen once a month or two, but lately it's become an ongoing thing and there's no end to it. I'm not having quality sleep everyday I stay up late so I'm looking to improving that, as also due to work from home I'm having a sedentary life last few months, but there should be more reasons to it.