Food alone would be a massive problem, with overwhelming starvation. Who really knows how to grow it? Who even has seeds right in their home? Has their soil been improved, or is it solid clay or nutrient-poor sand? How many people have gardening books on hand, so they even know how to grow it? And if they can grow it, how do they preserve it for the other three-quarters of the year? Can it? Do you have the glass jars and lids? How many people know how to make containers from glass? There probably wouldn't be any lids, so they would have to use paraffin. Where do they get the paraffin? No jar lids means no pressure canning, just hot-water bath canning, and probably some sugar. Drying in humid country requires heat and insect protection. Pickling requires salt or vinegar. Does everyone have a goodly supply of salt and sugar and screening or netting?
How about medicine? Talk about the Dark Ages! No autoclaves, no centrifuges, no electron microscopes, most diagnostic equipment are just doorstops, no incubators, and most of the medications will probably be herbal (that strange old lady down the street with the 17 cats and her three acres devoted to herbs, everyone's new best friend!). Can you imagine how today's doctors would be dealing with the problems?
This took me back reminiscing about the tattie howking and berry picking days of my youth during the school summer holidays during in early 80s, lifting the tatties to the sound of MJs Thriller on my Sony Walkman. Imagine the Hullabaloo you would have nowadays keeping the all the school children off school for a few weeks to get the harvest in.
A few years without electricity might actually save more lives in the long run as all those folks with sedentary lifestyles might actually had to do some manual labour, they would get leaner and fitter. The health and diet industry might see a particularly bad downturn in its fortunes though.
Probably the worst aspect of a post EMP attack would probably be someone having the idea that slavery might be worthwhile re-introducing as the ruling elite probably wouldn't want to get their owns hands dirty down in the farmers fields.
Hmm perhaps 90 percent casualty rates might not be out of the question after all as everyone starts shooting everyone else for that potato (but even then would they know how to cook it after prising it from someones cold dead hands?).