What Causes Fatigue And Hyperhidrosis Along With Dry Mouth And Tiredness?

Hello. I am very fatigued for 3-4 days followed by a day or two of extra energy. On the days I am energetic I sweat more and my mind is hyper. On the days I am tired, I notice my mouth is dry and my blood pressure is lower - I get extra sleep but it does not help. I feel that I have an imbalance in my nervous system to where it is either hyper or low. Are there any medications that can be used to regulate a nervous system? I am 33 male healthy not overweight and use no over the counter or prescription drugs. I have had these symptoms for 10 years and they have remained unchanged.