Ive been physically exhausted for 4 days now and Ive constally been craving junk food

Ive been forcing myself to turn up to my aeiral hoop gymnastic classes , I havent been on my pole at home because Ive been that exhausted but Ive forced myself to go out in town , Ive been constally craving junk food , Im trying not to eat it but ive had an bit because if you cut it out completely it makes you bindge , I havent had my period yet this month so maybe Im due in an few days ? I dont know what else it could be , im not under an lot of stress , the bus thing made me stressed out but Im over that now. Last night I was really depressed and im not feeling 100% mentally today. Any advice ? I have my therapy session tommorow so I will dissus this with her