I'm feeling lost

We had our 6-8 week check today, it was actually 9 weeks. I have had trouble getting Saana to sleep during the day if she has one short sleep usually between 10 mins and an hour in the day I"m happy. We have tried so many different things to try and get her to sleep and I really wanted some new ideas. The things we have tried are
* ergo
* holding her on our outdoor swing
* fit ball
* feeding to sleep, this works in the evening eventually
* bouncer
* baby swing

When I asked the nurse about this she suggested the following
* Not feeding again until 2 hours from the start of the last feed
* Putting DD into her cot while she is still awake (Both DH and I heartily disagree with this, it might work for some, but it just doesn't work for us. )

I don't really understand what the benefits might be of waiting 2 hours between feeds and it seems like such an arbitrary number.
I'm going to try it until Friday when I can go back, for one reason only. I think Saana might have reflux and the nurse indicated that babies become upset about 20 mins after a feed if they have reflux and if I actually record the time she stops feeding and wait I should be able to check if this is happening.

Mostly she is happy being held, but doesn't sleep and then get crankier & crankier over the day as she gets over tried, if she drifts off, she seems to wake as something hurts, sorry to off load here, but I'm feeling very hopeless & overwhelmed tonight.
I went for help and came away feeling worse.
Sally

OH and I think most of this advice stems from her wanting to stop me feeding her to sleep. I really don't think this is the problem I just want her to go to sleep in general.
This post feels really garbled, but I'm going to stop now before I start crying again.