There was definate giddiness there at first. But lest we forget, within just a few months of the wedding she was pregnant and had thrown herself down the stairs to get his attention.
Even by her own words, she was very very mentally unwell from the start. She never kept down any food and would stay awake for days on end. There was a lot of breaking glass and hurling herself into glass cabinates and cutting herself with it.
One story she told was having an argument with Charles and he wasn't reacting like she wanted so she grabbed a penknife from his desk and cutting herself all over her chest and thighs right in front of him. It gives you the shudders to think about it. The next day she wore a V neck top and shorts to meet her sister. Predictably her sister was horrified, but then equally predictably, Diana was disappointed that her sister didn't react exactly the way she wanted.
It must have been horrific.