Use the "Contact" link in the menu bar...though I prefer you post your questions here unless it's something private or embarrassing, so others can gain the benefit of my response.

JS

Thank you for the insight. I have/ will have plenty of other questions for you. I enjoy your articles and tend to agree with your take on fatty meats as opposed to the "lean is better" view of many paleo bloggers. What is the best way to contact you without posting a topic?

The difference between supermarket beef and grass-fed beef is meaningful...but it's important not to let the best be the enemy of the good.  A diet of supermarket beef is much better than a diet of supermarket birdseed.

Note that ruminants (cattle, sheep, goats, etc.) are much better at detoxifying grains for us than pigs or chickens...supermarket chicken and pork is much less healthy than supermarket beef.

I agree with Paul Jaminet that the first thing to upgrade from standard supermarket fare is eggs, from free-range chickens.  Not "cage-free" or other meaningless marketing terms...eggs from chickens that actually forage for bugs, grubs, and seeds, also known as "farm eggs".

eatwild.org and localharvest.org can help you find local sources of eggs, meat, produce, etc.

In general, there will be more health benefits from the fattier fish (salmon, mackerel, anchovies, etc.) and from shellfish (mussels, oysters, etc.)  I try to get most of my n-3 fats from fish, but I do take fish oil when I haven't eaten any fish for a couple days, or have been consuming a lot of n-6 (usually from eating out).

JS

Variety is the key. Some white fish, some fatty. Primal eating is not about finding one perfect meal and repeating it over and over ... keep your body primed by feeding it variety. Great that you eat fish, so aim for at least one white fish meal, one with salmon and one really oily fish meal a week. Get your shellfish, too.

http://www.localharvest.org may be able to point you towards some grass-fed beef farmers in your area, it's generally cheaper to buy from the farmer/processor than to buy from a retail store.

I choose to only purchase wild caught fish/seafood.  (a lot of farmed fish and shrimp are fed soy.  I don't think soy beans grow in the ocean).  Monterey Bay Aquarium has a list of sustainably/non sustainably caught seafood/fish.  If I ate more fish, I'd probably do more research on mercury content.  I eat it rarely.

1600-1700 calories is very low for someone your size...you're finding what many people do, which is that VLC foods leave you with very little appetite.  You'll be losing weight quickly, but you'll also tank your energy levels.

You might try a tablespoon of coconut oil (or MCT oil, if you can get it) when you feel the low-energy state coming on.  Also, you're flushing out a lot of water since you're VLC, and thereby losing a lot of electrolytes...consuming LOTS of salt for a while is worth a try, and might help with the pain and headaches (hat tip to Michael Eades).

Also, are you sure you're constipated (painful poops), or are you just pooping less?  Because you're eating a very low-residue diet, which means you won't need to poop as often as before.  Though if you're genuinely constipated, magnesium citrate will usually move things right along, as well as being good for you.

Zero exercise isn't good...don't kill yourself, but making sure you get some solid walking time in each day will probably help.

(Disclaimer as per left sidebar, etc.)

JS

That's a new one I hadn't heard before.  Perhaps you could inventory your diet (and supplements, if any)...and your approximate calorie intake.  A lot of people find that by cutting carbs and not replacing them with anything, they're cutting calories so dramatically that the lack of energy isn't surprising at all!

JS