@ladyinwaiting99 welcome! Losing weight is an adventure and this is your adventure. It isn't all about the destination, there are lots of NSVs (non scale victories) to be enjoyed and celebrated. We will celebrate these with you.
The side effects differ from person to person. For me, at the start, the main problem was slowed digestive transit. Not constipation, I just felt like I had a week's worth of food inside me moving very slowly. Which, to be fair, I did.
Psyllium husk capsules, more vegetables, all-bran, increasing fluid intake have all helped with this problem though not completely solved it.
If you are taking any other medication it is a good idea to make sure your GP surgery are aware. All my dosages of my other medications have changed as I have lost weight and changed my diet. While some things have reduced others have fluctuated.