Symptoms come and go?

For the last few days I've had loads of symptoms: cramps, urge to pee, insomnia, sore breasts, huge hunger, day time exhaustion, heartburn, dizziness and so hot!! But today I feel a bit cooler and the urge to pee has gone, less thirsty and cramping less, no more dizziness or heartburn. Basically less symptoms overall. Is it normal for this to happen? Only 4 weeks tomorrow. So nervous. I should probably relax, but so hard!! X