I Am 44 Year Old, 165 Cm Tall, 54kg. I

I am 44 year old, 165 cm tall, 54kg. I haven't had a period for 4 months. It is important to mention that since June 3rd my husband and I are on a bicycle tour. We crossed USA and currently we are in Mexico. What do I need to do. I had a consultation with gynecologist who checked my organs with ultrasound and said that everything was fine. He prescribed me antidepressant, which I didn't buy because I don need it.