When do the cons outweigh the pros?

I've had focal seizures (and a few tonic-clonic) since I was 11, I'm now 23. Since they put me on Keppra when I was about 13, I've just felt, at best, like I'm in a fog, and at worst, like I don't want to live anymore. Recently, they took me off Keppra (as I was on it for about 10 years, ending at 3500mg, no improvement) and instead put me on Briviact, which, for the past month or so that I've been taking it, has curtailed the seizures, but is making day-to-day life, especially work, almost unbearable. I'm not sure if all the problems I'm experiencing are related to it, but I know some have to be, with how sudden-onset and unusual they are. For one, I have headaches all the time now. At least twice a day, for at least an hour or two. I've been "assured" that these are not linked to the medicine, and since Ibuprofen helps, I "don't need to worry about it". I feel like I can't think. I had minor brain fog with Keppra, as I've read is common, but if on a scale of 1-100 with 1 being no problem at all and 100 being completely incoherent, I felt I was a 10 or so on Keppra, and at least a 50 on Briviact. I've had short episodes where I wasn't really able to speak because my brain just wouldn't process what I wanted to say. It...was...like...if...you...were...talking...like...this. I've never had any issue with memory -- in fact, I've always had an excellent memory, and now I forget things, maybe not so important and very important, almost immediately. This has especially become a problem at work, because my boss, despite knowing my predicament, is unsympathetic. It's like if someone tells me something and I turn around to do something else, I will probably have forgotten what they said -- no matter how important it was. I have always been a fairly calm person, even when I'm stressed (which is also increased, 'tis the season, right?), but now the smallest inconveniences make me want to scream and break everything around me. Of course this is an issue at work, but I live with my parents, who also, despite being very aware of the circumstances, treat me like a toddler having a tantrum even though I have told them I think the medicine is making me irritated. At one point when I had to go to the emergency room for the "talking...like...this" because they thought it was some kind of odd seizure, my dad and I had a screaming match which ended with him telling me they were going to come take me away and strap me down in the psych ward if I didn't stop acting like a freak. I will never forgive him for saying that, and I think about it literally every time I talk to him, no matter how pleasant the conversation, and I just have to sit on my hands because I want to punch him. It's only been a month, so I think it's too soon to say, yay, this medicine works! But at what cost? It's hard to say if I'm being rational at the moment or not, so I'm just curious, from the perspective of people in a similar situation as me, at what point is "being seizure-free" (assuming the Briviact continues to work) not worth feeling like hell all the time? I imagine if it continues to work perhaps I'll eventually be happier because I'll be permitted to do things like drive and have a social life and not immediately have to "warn" people about being around me, but right now it's absolutely miserable.