morning sickness again?

Hey everyone! So I'm 33 weeks pregnant and the beginning of this pregnancy (this being my second) was very rough for me. I lost 15 pounds in the first 16 weeks and was very sick. I'm a massage therapist only 2 days a week right now and I was having to leave appointments due to hot sweats dizzy spells nausea and sickness. my doctor came to the conclusion that it was dehydration so I have been drinking water and keeping up with my eating like crazy!   Now at 33 weeks it is all happening again! It's only when I'm doing massage but this time rest eating and hydration wasn't working I was on the bathroom floor at work and my body couldn't move I wasn't able to get up at all and my body wouldn't cool itself off I wasn't even able to drive home. I called my doctor and she practically ignored me she just said to do all the things I was already doing and if it kept happening to come in (this is the second time it has happened in a week!!) I'm just frustrated and don't know what to do! I had the fan on in my massage room and even sat down to massage the client before having to leave the room! I hate doing this to my clients! I feel like an awful person! I don't want to let them down I'm trying to push myself to stay with my clients for as long as possible but I'm worried it's taking too much of a toll on my body! I'm just wanting some opinions of other pregnant moms with similar jobs to help maybe make sense of what's going on or what I should do. Thanks for any input!