I Started Getting Finger Than Toe Cramps.. I Took A

i started getting finger than toe cramps.. i took a nap and woke up an all of a sudden i got cramps in my inner thighs.. i couldnt stand up for 5-7 minutes and they were super tight like i was flexing my muscles. it finally went a way but it was real scary. never felt anything like that before. even the vericose veins in my legs were bulging out. i started gettin cramps in my fingers earlier in the day.. i am a fuel truck driver and a mechanic.. im in the sun all day today in south fl. sweating terribly all day but i drink plenty of water but by the end of the day im soaking wet. is this a sign of dehydration or heat stroke or ??? thanks.. Sal