I am very sorry about all you have undergone in last six months.
In all likelihood, you should completely recover once the stress is over and you would come out of this relationship. Stress and anxiety can cause all these symptoms which you had enumerated including absence of period for long duration. Stress caused by psychological issues affect our body hormones which in turn affect the skin texture, body metabolism, appetite, sleep etc. So once stress is eliminated, gradually everything would recover back to normal. Following measures can help;
1) Cognitive-behavioral therapy (CBT) and operant-behavioral therapy (OBT); done by a psychologist.
2) Relaxation training and biofeedback.
4) Acupuncture and acupressure
7) Group sporting activities
8) St. John's wort
10) Valerian root
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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