You’re not supposed to mix fruit with protein, especially not after a fast when the digestive system has been reset and is sensitive. Mixing fruits with protein leads to fermentation in the gur, that’s the pain you’re feeling. Read more on proper food combining
Update; It’s all good. Mustve been a mistake with the fruit juice. I got checked in the hospital (I’m in a country with subsidized healthcare) and everything was normal. Probably happened to press my arm in the wrong position the same night i was finishing my fast. After coconut water I felt alot better too!