Bonnie, I haven't seen a post from you in a while and wonder are you still out there just quietly reading the posts or have you gone away for good?
I agree w/ you that different people react differently to medicines, e.g., BP meds. My brother-in-law was like you, slender, yet unable to keep his BP down w/out the proper meds. He finally got the correct dosage to work for him.
As for not being able to swallow the oil, (no lecture here so please read on), at one time in my life I thought I couldn't swallow Alka Seltzer or Pepto Bismol. I gagged. However, when I got sick enough, I discovered I could chug them down w/ no gag reflex. Not so w/ cottage cheese. Unless it's mixed w/ something else (maybe some pasta and tomato sauce!!!) I'm going to gag. My point is that the mind is not always able to conquer that gag reflex.
Now, as for the oil pills, you might try those. Jorge Cruise wrote about flax pills in '8 minutes in the morning'. This is just another form of oil, so you might try those or maybe fish oil pills, or some other form of oil pills. In other words, don't give up yet.
You say you've been doing SLD for 2 weeks w/ no success. Some people on this site have been trying it for several weeks longer than that. Maybe you need to hang in there a little longer or perhaps change what you're doing, e.g., the time you're drinking the SW or the amount. The people here are terribly supportive and want to help each other, so I'm sure you'll be given new ideas and suggestions.
Lastly, there's probably no such thing as a quick fix. Not all of us are like RickM (sadly!!!) and can lose 18 pounds over 5 weeks (or there abouts). As Oprah Winfrey said (and I'm paraphrasing here) ''if there was a quick fix, I'd have found it or bought it!"
Hang tough w/ the rest of us. Keep trying.