Struggling with eating habits, need advice

wondering if anyone else goes through this? I have moments in my life where I will just not eat unless I absolutely have to. they would usually last any where from 3-4 weeks to even months at a time. I really haven't notice any weight or fat loss, but I do see some muscle gain. im in welding in votech and that is basically my daily workout, besides the yoga I do occasionally through the week. and im now since recently, have been caring to grandmother who is bed written and is now another workout. today i can barely hold half a burger. and im just now calling it a day. should I be worried or am I just happen to be getting stomach viruses left and right?