Hi
Good morning!
First of all, that’s a wonderful consistency to maintain all these years. Taking a pre workout supplement for 5 years continuously, may not be good for your health.
I understand that your blood test reports are fine. But have you looked for
Vitamin D,
B12, fasting insulin,
TSH and
kidney function test? How is your water intake, sleep and stress levels.
Poor gut health could also be a reason for exhaustion. Reduce the intensity of your workout for 1-2 weeks. Try taking pre workout foods like low-fat yogurt with fruits, oats with milk and fruits (1-2 hours before), or fruit smoothies.
Next Steps
I would recommend you to schedule a one time consultation through my website, to understand the root cause here and help you better. I specialise in Sports Nutrition.
https://www.pragmaticnutritionist.com/
Health Tips
Please stop taking the supplement, until you figure out what is causing the fatigue.