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You could be having problem in the hormones. The thick blood and severe pain
could be consequence of hormone action on uterus
which caused increased bleeding and delayed periods and ovulation as well. It is better to consult your Gynaecolgist who will examine you and may put you on contraceptive
medicine to regularise your cycles. Also get tested for PCOD which can commonly cause this. Get a PAP Smear
done as well. Try to avoid much stress
as stress can cause more chance of PCOD and disordered menstrual cycle. Do Yoga for stress relief. Eat plenty of fresh fruits and green leafy vegetables. Do regularise exercise. Get 6-8 hours of sleep daily.