Deep Tissue Massage Toxins

Deep tissue massage question: what will happen if…?
My physical therapist told me that I had to drink water after the deep tissue massage he performed on my neck and shoulders today because toxins are released when you get one. I didn’t get a chance to ask him why & what will happen if I don’t?
Not all people experience this, especially if they are used to regular massage, but in general you will not feel very good. Your lymphatic system-the system of fluids which essentially clean out your body- would be working extra hard (as a result of the massage) and you would feel like you were getting, or already, sick. In other words you may feel stuffed up(sinuses), achy, very sleepy, possibly nauseous, etc.
It is NOT a good feeling and if you are not used to getting massages then your chances of feeling this way are very high if you dont drink lots of water.
I always push this fact hard on my new-to-massage clients, because the few that dont listen to me severely regret it the next day.
Swedish & Deep Tissue Massage : Swedish Massage & Body Toxins