Thank you for all the information,
I am sorry for your symptoms.
Mucus mixed stool can be due to bacterial infection.
Presence of blood can produce caramel colored mucus.
Sudden blood mixed mucus is usually due to bacterial infection.
You would need antibiotic to cure infection.
You will not get antibiotic as OTC.
Imodium can reduce the frequency, it can be taken.
Take more fluid to prevent dehydration.
As you are having flight, I would advise to consult doctor in person asap.
I hope this information helps.
If there’s anything else I can do, please let me know.
Wish your early recovery.
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