I don't have a lot of tips other than regular exercise, good diet and honoring your moods but I wanted to say that I"m feeling in the same boat as you.
Lots of anxiety, lots of past 'triggers' I think that are getting stronger, lots of sad emotions. I link a lot of them to anxieties I have (about my gaining excessive weight, about my relationship -again more linked to past bad relationships and those triggers then my current one) and just feeling more sensitive and taking things more personally.
I keep harping at my husband lately. I read a lot of his actions as paternalistic (even if they aren't) and keep convincing myself he doesn't want to be around me as much anymore, which then plays into my weight anxieties, etc. I know I could work on my exercise and yoga more (those were abandoned in the first trimester when I felt so sick and I haven't seemed to get back into a schedule with them since).
I think a big piece of advice other people gave me was to really honor my emotions and not try to write them off. It's hard because although I might disagree with why I'm feeling a certain way, they almost always have a root that is a genuine concern / anxiety / fear that I seem to be experiencing (usually from past issues I am learning I haven't fully dealt with). One person explained it to me like this:
A lot of the moods and emotions you will feel are going to be very strong... this is the universe's way of speeding up old emotional garbage that doesn't serve you anymore and it's in your best interest to identify, and deal with them or at least become aware of them as you prepare yourself to enter into motherhood
So that's how I try to look at it.
I feel like i'm ranting right now because I just so happen to be in a somewhat hyper-emotional state as I write this. I think I wrote it more for me to get it out and remind myself of some things than anything else :)
Know you aren't alone and there's nothing wrong with what you're going through!
Follow Mothering