Does anybody struggle a lot with eating?

For me (F27), eating is almost as difficult as showering sometimes. I get so out of breath, my heart starts pounding, I get chest pain and feel dizzy. I only get relief when I lay down. These are the same symptoms I get when I take a shower longer than 10 minutes. I don’t even eat a lot, and I’m a slow eater. I just don’t know what to do or why this happens. I try to have my legs bent to chest to help but it doesn’t really help anymore. I don’t always struggle like this but most of the time I do, and I don’t know what to do to help myself not feel this way. Anyone else struggles with this and has tips to help?