very severe or severe.

how do we feel when we are very severe all the time because i am beddriden since 7 months i don't know what i have i feel weakness more than tired like i'm dying of a sickness cancer in terminal level. but blood test are okay and i did EKG it's okay. when i walk it's worse.. i can't go out without feeling like i'm fainting like i have no blood in my head.. i dont know :( i'm scared it's a heart problem ? or maybe cfs... idk... doctor don't help i live in france i'm just crying in bed all my family don't even care i just wanna speak with someone who have cfs to know if i have cfs...

i wanted to buy melatonine but idk if it's a good idea