I don't think you would get withdrawal symptoms with 75 grams of carbs a day, but everyone is different so it's hard to say. I don't get the symptoms doing 20 a day but some feel like they have the flu.
I'm doing Atkins, and though you don't have to count calories I do because I find it's easy to eat around 1000 a day if I'm not paying attention. I just don't get hungry because without all the bad carbs from breads, pasta and sugar I don't get those spikes and dips. I aim for anywhere between 1400-1800 calories a day and use fatty things to keep my calories high.
With most people, they find they can eat more calories on low carb. I think you should try it out because there are a lot of people that have success with it. I personally find it easy and I love how energetic and awake I feel. I restarted Atkins on Saturday (I just had a baby about 6 weeks ago) and I've already lost 5 lbs. I also used it to get to goal here before about a year and a half ago.