well, there's a lot of things you can do for your immune system. i've never heard of those herbs... i don't take them either. i would suspect that if you want to really 'support' your immune system for every day life, you should not take any herbs. first, your diet looks extremely low in fat. you need to eat cholesterol for your body to repair itself. throw a half dozen eggs in there, maybe some liver and onions fried in butter. you need to eat fat. i know there's evidence on both size of the story, but you need not worry about saturated fat if it's not hydrogenated. fish oil is a great supp. you can take quite a bit of it, but watch out with the nuts. that's a lot of unsaturated fat, which is not great for the body. i'm sure i'll get flamed for some of this, but i have info about it if anyone cares.
also you need to make sure you get plenty of sleep. even take naps if you can't sleep for a long time at night. you'll figure out what is the best rest time, but if you're getting sick it's probably not enough sleep.
glutamine is a cheap and good supp. for the immune system and overall for bodybuilding etc. you might consider taking that.
you could take coconut oil, which is a natural antiviral. they often give it to aids patients to help them so you can imagine it's a great thing! don't worry about the fat, trust me, it's awesome. you can even read in the archives about the coconut milk post we had just a little while back and how great it is for you.
colostrum may be good, but it's incredibly hard to find and expensive from what i've seen. if you can get it, go ahead and use it, but don't rely on it. i would boost your own immune system with food and healthy habits before relying on fancy stuff like that (which by the way hasn't been proven anywhere that i've seen, so it's your cash )
if you feel a cold coming on, up the vitamin C. i would take at least 2g a day or more daily, but if you feel like you're coming down with someting take more. LOTS more. 5 or 6 g if you can (and not get digestive issues . take with food etc.
relaxation is also good for the immune system and the adrenal glands. try 15 minutes a day of meditating or other relaxation, no stresses on you.
hmmm, and of course, just eat well. sugar compromises the immune system so if you don't feel good, don't do the honey or fruit, or even white bread such as your pita bread. especially ditch the junk food at night. it's not helping you in any way.
if you can get to a Whole foods market, or some other organic type market, see if you can find Coconut Macaroons, made by Jennies. and limit yourself to two as a snack. coconut is beneficial as i told you earlier and it's also got fats which slow down that nasty sugar response from the honey. they're also free of wheat and other nasties. it's a WAY better snack than nasty muffins with their gross fats and sugars!!
if you have more questions, let me know. i would love to help. it took me a while to build my immune system and lower the adrenal stress i was having, but i feel much better now and i was lucky enough to not get any of the christmas germs or even the 'spring' bugs that went around!