At wits end...

I know that's a dire sounding title but getting to that point and am hoping I'm not the only one and that someone may have some suggestions.

I have a 15 month old. 3 months ago we moved to Toronto and since about that time she's completely changed. I'd been to Cecile before that when she was about 8 months because she'd been waking up every 45 minutes from about 4 months and she worked with me on a not CIO kind of plan. Along the lines of No cry sleep solution in some ways but did involve leaving her in her bed and being there to comfort. It worked great after some glitches and she not only slept on her own but slept through the night for the most part. Then we had to leave her with my family for a couple of weeks to come here for some set up in June and while she did fabulously while we were away she got clingy when we got back and hasn't stopped since. While we were away, if told my mom to do what it takes and not to upset her in anyway so there were some days when she didn't want to sleep on her own and mum held her.

Now here are my issues

1. Her sleep had gotten terrible. She won't sleep inless I sleep beside her and when I put her in her bed she'll sleep for a maximum of a couple of hours at night and 45 mins in the day. When she wakes she doesn't need feeding we just take her to our bed because im exhausted and she hangs onto my hair for dear life and sleeps at once. Won't let my hair go at all! Now it's even gone to the same in the daytime
2. I'd moved a few weeks ago to one nap because the time between naps was so long that her days were getting really long and she was tired so gave it a try. She's just not sleeping longer that 45 mins unless I hold her. When I do put her down a bit earlier she sleeps for an hour or hour and a half at most so I've gone back to 2 naps making the one in the afternoon shorter coz she won't sleep at night when I let her sleep.
3. She's always been a bad eater and nothing has changed. Thought 15 months would mean some kind of change. While she'll taste, she just won't eat for nutrition. And while normally this doesn't bother me her doc has said she's low on iron because babies who drink a lot of milk tend to absorb less iron and has suggested I try to reduce milk or switch to cup and see and if it doesn't then he'll give us iron drops. The cutting of milk isn't working because she just won't eat and I can't just cut her off.
4. Behaviorally, she very very clingy and whiny. I should say she's teething and has had a lot of teeth come in in the last 3 months including some of her first molars. She won't let me do anything. I need to sit with her or at arms length at all times if I try to go cook or clean up she's standing at my legs whining and crying till I go back with her. She plays fine on her own but I have to be visible. Or my husband of course but of we're both in the house then she needs to see us both.

This is getting very frustrating because we don't have any help and if we can't get anything down when she's awake and she needs one of us around when she sleeps as well you can see the logistical nightmare we're in

I know I've probably got myself into a lot of this. But I've always been more attachment parent-like with a good schedule. Might've have taken it into outright giving into toddler tantrums though. I don't know anything anymore. Just that I'm tired mentally and sick of the way my life is in a lot of ways and just want to be a good parent. Just don't know how now.

Help?

Ps: sorry this is long and sorry about typos. Typing while she sleeps and want to post before wake up.