Memory Loss and Lamictal (Lamotrigine)

Ok so I've seen this topic been posted many a times but there are a few things I want to add. I am 20 years old and from the UK and have Absence Seizures (Petit Mal). I started taking Lamotrigine in April 2015 and have arrived on my max dose of 300mg Daily. (150mg x 2). In my job in the past 12 months or so I have started to feel that my memory has gone to dust. I often find that if someone rings the office asking for my colleague but they are on the phone, I tell them 'I'll let them know you called'. But I completely forget to tell them that they called even if it's just minutes after they called. (If that makes sense)... Following that statement I actually had to think about what I was saying as I find that a lot of the things I say nowadays do not make sense (even if they do in my head). I find it hard to tell my friends stories about things as I struggle to get my words out, making me feel like such an uninteresting person and that I have nothing to offer to a group conversation. I work in IT and if my Colleague asks me to go and do something, I often find that by the time I've left the office I completely forget what I was meant to be doing (or some of the details of it). This also happens when my mum asks me to go and get something from the garage. I often get distracted on the way there and forget she even asked me to get it, or I just get there and forget what I'm meant to be getting her. It's just becoming a pain because it's making me feel stupid. I feel like others will think I'm unintelligent because I can't get things right the first time and I have to ask them to repeat themselves over and over again until I finally remember what they have said. I got 12 GCSE's A-C and 3 A levels so I know I'm not unintelligent. There are a few other side effects that I have such as tremors and clumsiness (but that's probably just me) but they aren't affecting my job. My cognitive function has decreased dramatically as well, it takes me a while to think about what I am going to do and in what order. People think I've just really dopey and dumb. Does anyone else have this issue and what have you done to overcome it? I'm sure there are a few things that I have forgotten to put on here (pun intended), but if there is I'll post another comment below. Thanks for your help!