I had a similar experience to yours - a teacher was able to give me some help and taught me just a little, but had no slots available for about 5 weeks. (You've gone months?! Ouch!)

One of the things he told me that first time was that violin is 90% right hand (bow) and 10% left. You could quibble about the percentages (maybe it's 80/20), but from what I've seen, he's more or less right.

So all the time you put in practicing proper bowing will pay you handsomely on down the line.

I'm in the no-tapes (dots) camp. He told me to learn intonation by ear, and it was much easier than I thought it would be. I still (at about 5 months) have problems hitting the note I want precisely, but it continues to improve, and I can almost always tell when I'm off.

The biggest thing is to be able to hear the note in your head. If you can sing or hum in tune, you can do that. Just do the first 5 notes of a scale, with the open string being the lowest note.

A good bow practice technique he gave me when I finally did get lessons - use a metronome and play one note per whole bow. (Start at one end and get all the way to  the other by the end of that beat. Try about 35-40 BPM to start.) Do 1 down and 1 up.  Then play two beats for one bow (always going end to end). Then 4, then 6, then 8, (and if you can, 12 and 16).  Good for practicing bow control, a straight arm, playing fast, playing slow and playing in tempo.  (I don't do it nearly as often as I should.) It's a good enough exercise that he still does it, and he's been playing 30-40 years.

Re difficulty of violin vs flute...   I'd say to get to the "competent beginner" stage, it's not a lot harder than flute. Completely different set of problems, but the overall difficulty is probably comparable.

To get really good...  I don't know enough about flute to offer a good comparison. I do know that people who have been playing 30-40 years can listen to something they did 10 years before and point out ways they've improved. It's a very deep instrument in that sense.

One example: Vibrato. There are four fingers, and every one requires a slightly different set of muscles (so you have to practice each of them). There are four strings, and playing it on each string is slightly different also. There are at least 3 (maybe more, I'm still a not-quite-beginner with vibrato) zones on the violin for doing it (up near the scroll, up high (pitchwise) on the strings, and in the middle), and the each present their own set of challenges. You should ideally be able to play a slow or fast vibrato and a wide or narrow one (wide referring to how much the pitch changes).  So that's 4x4x3=48 things to practice into muscle memory to have a basic vibrato, and 48x4=192 things to have a good, expressive one. And all of this is with a set of muscles that you've probably never used before, so your subconscious has to figure out how to coordinate them so you'll have speed.

And there are a lot more techniques to learn for the right hand than the left.

That's not meant to discourage you - you can get to playing quite decently in a few months (damfino just posted "A year in Review", if you want to get an idea where you can get to in a year).  But mastering it, I'm not sure anybody has ever done that fully. If it can be done, it's a 30-40 year process.