Hi,
Welcome to HCM,
Clomid has caused multiple follicles  to form, which is basically a good response of it, and it gives hope that your response to ovulatory stimulation drugs is good, and thus chances of 
pregnancy are also good. Your breast tenderness is due to 
Duphaston. Thickness of endometrium is 6 mm, which is bit low, normal should be between 7 mm to 16 mm. May be next cycle your Doctor may decide to give you natural progesteron vaginal pessary instead of oral Duphaston, which will reduce side effects, and increase chances of better endometrial thickness. 
When you get your period after clomid, your period could be more painful. At the same time , usually those women who are so impatiently waiting to become pregnant, they feel different type of vague symptoms, when they realize that this cycle has gone unsuccessful, and period is about to come. 
besides that  your symptoms could also be due to  too much stimulation of ovulation due to clomid.your doctor will  rule out hyperstimulation due to Clomid, and may advise you to not to take any ovulation stimulating drug for next cycle or may ask you to take oral 
contraceptive for the next cycle.
Do not become impatient. I feel that once your 
fibroid has been removed, if there is no other problem, you will conceive soon hopefully.
Best wishes.
Dr H Hamdani