I feel sad ... I don't know why but I just do.
Sorrow is a good emotional barometer, it lets you know that there's something wrong emotionally or physically. What is most important is you examine yourself for the cause of the sorrow.
Should you find there's absolutely nothing causing the sorrow, you may want to seek help. Good luck, I'm rooting for you!!
Leave all technology aside and take a routine walk through a forest of some sort or nature trail every week or two.