My son had a really fussy time at about seven every evening too- whether I was there to breastfeed him or not. He wasn't hungry-and didn't want the breast - that wasn't the issue.
I just used to walk him - as in - standing up and holding him either over my shoulder or holding him over my arm, so that his stomach was pressed into my arm, because it seemed that pressure on his stomach felt good to him. And as I liked to take a walk every day - and especially enjoy walking in the evening - this is the time I'd take my walk. It also helped to distract me and him and was more pleasant than being shut up in a room in the house. He'd start looking around him and get interested in the scenery and that would distract him - and I'd be getting some exercise and fresh air- and that would distract me-even if he cried the whole time- which he sometimes did.
When he was about six weeks old, we went on a trip and there was an indoor heated pool at the place we were staying.
I happened to take him down with me the first evening and just sort of rocked him back and forth in the water - HE LOVED IT- immediately calmed (even though it was his fussy time and I'd been ready for him to fuss through the whole thing) and I figured that if he found the warm water soothing (like being back in the womb I thought) I'd give him his bath during his fussy time and see if that worked when we got home (since we didn't have a heated, indoor pool).
Maybe you could try that.
Worked like a charm for him.