It can be unexplained depression. It needs to be treated asap otherwise it may get complicated. It can be well treated with homeopathic medication and counseling sessions effectively and without any side effects.

Hi... Please consult a General Physician (doctor) first to rule out the impact of contraceptive pills. Intercourse in itself is not just a sexual act but it also involves lots of exchange of pent-up emotions, desires, guilt, pain, etc. It completely depends on what state of mind you were in and what was going around in your present environment and recent past. If the doctor concludes that everything is fine physiologically, then we can attribute your sudden changes in mood, social interaction, appetite, crying, waking up with heavy heart and blank mind, etc. to your mental health issues (most probably depression).

You need to consult a Psychologist for having insight into a problem.

I-Pill, the emergency contraceptive, can, in rare cases, bring in mood swings, tiredness etc. which go away in a few days time. On the other hand, please check out if you are carrying any emotional / feeling issues like guilt or anxiety. In any case if the symptoms persist, please consult a psychologist (if you feel that your condition has more to do with thinking, feeling and emoting) or your family physician if you feel that your issues are more physical like tiredness, fatigue etc.