12 hour bus journey and serious period symptoms

Hi girlies! Needs some advice...

I’m travelling for twelve hours total from early tomorrow morning and my periods just arrived. Now normally this is no issue. But every now and then I get reallllly bad symptoms.. fetal position cramps, headache, nausea, dizziness and it’s one of those months so I have a few questions...

1. Does anyone ever get the same as me? Like minimal symptoms for a month or two and then the following month full blown Symptoms and heavy flow?

2. Any tips for travelling on a bad period?

3. Any tips for sleeping while travelling, I feel like sleep makes everything better 🤣

Thanks in advance!!