According to your history i have gathered that you need to do TWO main things
1:Kindly check out your scalp from a dermatologist
if there is excessive dandruff and you be suffering from Sebhorriec Dermatitis
,a main cause of untreated hair fall
2:Kindly do a full blood count and thyroid function tests
. if the hb is low or there is a hormonal imbalance so it should be corrected promptly and the hair fall can be stopped.
One other suggestion if the itching has started just after using Minoxidil
then you have top see you Gp AGAIN to rule out allergy to it.
But if not then it is said that you have to wait for one year for its effect,if no results then its not for you.
Then there are some other options and you need to see a dermatologist for a complete review.
i hope the answer would be of help,
All the best.