Many things can cause this. Alcohol and its dreaded Hangover is one of them. The consequences of alcohol and the fluid/volume imbalances causes, along with the disruption of normal gut mobility and chemistry often; symptoms of bloating, gas, increased urination, dehydration; and other issues, all of which can directly or indirectly lead to the discomfort you describe. My suggestion is to ensure your chemistry and physicality returns to a normal state after experiencing encounters with toxins. These include multivitamins, a diet with nutrients, electrolytes and hydration, along with Folate and B-12 depending on the length and or recurrence of these episodes. If symptoms continue I highly suggest a visit with your primary care and or emergency physician. I wish you the best.