You are not alone. A lot of ladies are experiencing PMMD without even knowing what it is, but you took the pains to some research about it. Worse still, there are people who even make fun of these sufferers not knowing the seriousness of their experience.
It is not fair to treat someone's emotions lightly because you feel they are being unreasonable. People's emotions should be respected.
Keep facing your life with positive attitude, M'lady.