normal? or am I over reacting?

So, I'm 17week +3 and every night for the past 4-5 nights I've been in pain. 
The whole of my belly hurts, like all over. It feels like it's too tight as if I've eat too much my belly needs to stretch some more to allow room. Sometimes it feels like muscle cramps and I also get this cramp in my calves. 
This wakes me up constantly all night and I'm constantly tossing and turning. It only ever happens at night though and then completely normal throughout the day. 
Since this my belly has gone quiet hard and swollen too. 
I was worried at first and called triage, they advised me to take paracetamol and everything sounds OK as I've had no blood or loss from down below. 
Has anyone else experienced this? And is it normal?!  This is my second child and never had this sort of thing before 😫😫