A lot of people say they go through detox; but, really, any time you change your diet (especially so dramatically) you'll get symptoms.
Some raw foodists also say they get detox symptoms at various times -- like some will immediately go through detox; others will months later.
Also, some say it took going "100% raw" to go through detox or get any benefit; others, not.
One common complaint is feeling very tired and having to rest and sleep. So you may just need to do that.
I've been 100% raw for over a year, but I do not adhere to the "100% philosophy" nor is it my goal; I'm just 100% because that's what I'm comfy with right now and doing very well. It's just a dietary choice right now, not a "lifestyle"; and certainly involves no ethical conundrum.
Not to ramble about myself... lol.
Okay, so, no, I, personally had no detox since I had a fairly decent vegan diet for several years before starting.
Yes, I lost some weight, but not much; since I was already at my ideal weight. I actually got a bit skinny, which I didn't like, but stablized back up to my ideal within a couple months or so. I actually lost fat as opposed to weight, which was nice.
I did not lose strength at all. As a matter of fact, I had a surge of crazy energy! That does not seem the norm, though; most people experience lethargy, etc.
Calories: Are you a male? I ask only because too much weight loss and difficulty in getting enough food seems to be what most men go through.
What are you eating? If you are eating a majority of low-calorie fresh veggies you probably need to increase your high-calorie fruit intake. Also increasing your consumption of nuts and seeds is good for calories as well as protein and other fatty foods such as avocado, and raw olives (buy online if 100% is your goal). You could also consume concentrated calories from dried foods, like raw crackers, breads, cookies, etc., and add sprouted grains and beans to your diet.
So what are you eating?
ETA: Here is a raw food bodybuilder who has a specific way he stays in shape: http://www.charliesgym.info/