I am Dr. Arun and will be helping you today.
I am sorry that your question was unanswered for long.
The hair loss and texture change can be due to;
a) Presence of systemic disease like thyroid (this has been ruled out by TSH test), iron deficiency, systemic lupus erythematosus, dermatomyositis.
b) Recent psychologic or physical stress
c) Medication or chemical exposure
So you doctor need to do the blood work for above systemic diseases and also do the following tests;
1) Hair Pluck -Trichogram
2) Hair growth window
3) Hair pull test
4) Hair shaft examination (Clip test)
Biotin (a vitamin) is available over the counter at health stores and you may start it; deficiency of which have been associated with hair loss. If needed, your doctor may prescribe, Minoxidil, which may help hair to grow. A medication called as Spironolactone may also be considered in some circumstances.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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