Thanks for your thoughts on this.
Just to update, I feel like fever is coming up. Last night it was 36.7C(98F). Today it was 37.6C(99.6F), i guess mild fever. But I was able to go to the gym and work out for 90min. Brought some over the counter lozenge and syrup which is helping to sooth the itch and cough.
So I guess I'll just wait it out. Like what some of you have said, it isn't as bad as you guys described. I'm still adamant that I might have gotten the flu from my sister's family. More proof, my mum has it too. She had fever last night.

Since I'm gonna take Lamictal for a long time, I'm bound to get flu or some sort of virus or infection externally right. That's the main reason I wanted to bring this topic up. If I'm having to have keep worrying and obsessing about the side effect, I guess it just defeat the purpose of taking the medication. I'll still watch out only for the rashes when its starts to appear. There were many incidents whereby the docs said the problem isn't serious at all. I don't want to appear as worried freak them no more.