I’m anxious

Last time I had sex was January. I got my period the following month in February and took a test that came out negative. I also got my period this month (March) and idk I’ve just been so bloated and I’ve gained weight but I think this is all just mental like idek. I’ve been hella anxious and I just need reassurance that I’m okay bc I know I can’t be pregnant but I’ve been getting headaches and been so stressed and tired but that can be from anything?? And I already got a NEGATIVE test. I’m in my “fertile” period and idek WHAT is going on rn like what is this SUPPOSED to feel like? Like am I okay? Normal? Idk. I guess when I’m not thinking about it, I feel nothing, but when I get home from work or school I’m like it’s all I think about and I start thinking about every little thing my body feels so idek. Can y’all help keep me calm and collected?