@cherrycoke: Hi Cherrycoke, I am in a bit of a similar situation so I hope I can help….
The good news is that you have plenty of time until your wedding to get it sorted out (I am guessing your wedding is in October 2012, not 2011..?), so there is no need to stress. You can have amazing skin for your wedding.
Firstly, do not get back on the tanning beds. You are ruining your skin for life. Sun is terribly damaging for your skin, its just not worth it. Use fake tan and bronzer and protect your skin. If I were you I would always wear an SPF base when you are out as it sounds like you have already damaged your skin.
Secondly, find a skin routine that works. I went off BC in preparation for trying for a baby after the wedding and it has literally killed my skin. Loads of breakouts/uneven skin tone every where. I was so panicked I almost went back on the pill for this exact reason in desparation. However in the space of a month my skin has turned around. Here is how.
I use Murad body spray on my back chest. This is popular in the UK but I know you have similar brands there, like Glytone back acne spray. If you use this every day you will solve your back/chest arm breakouts. I spray mine after I shower and then blast myself with the hairdrier as I can’t be bothered for it to dry. (What ever works for you).
On my face I use proactiv 3 step and a 5% Benzol Peroxide cream (After the reparing lotion step I put on the Bridal Party where I normally suffer breakouts). The first few days when you start it will dry your skin out, but don’t stop using it. Your skin will adjust. I promise.
Now because you are using these treatments you need to invest in a very good moisturizer to pamper your skin and help it cope with the anti-acne treatments. I use l’Occitane ultra rich face cream which doesn’t anything irritating in it and does wonders for skin tone.
I cannot stress how important it is to moisturize in the treatment of acne. I know it seems counter-productive but it works.
Now onto the two other points. Microdermabrasion works wonders. I have mine done 3 days before I have an event where I know I am having pictures taken of me and my skin always looks so nice. But make sure you have it 3 days in advance as the day after you are prone to break out and the skin needs to breath. I would seriously recommend trying it out and finding a salon near you where you are happy with the treatment and are able to have it done three days before your wedding.
The other thing that is more expensive but certainly works is laser. I have had anti acne laser and it was incredible is promoting even skin tone and making skin fight the bacteria that cause acne and getting rid of sun damage marks. I know this is expensive and not an option for everyone but it really works.
Lastly you metioned you are going to your derm. I have seen dermatologists so many times and they are very geared towards medication. I have tried meds and can honestly say they do not solve the problem. He may put you on anti-biotics but as soon as you stop taking them you will be back in the same place. Also, they are not suitable for if you are TTC so for me they were not ever an option.
Sorry for my very long post but I was keen to try and help.
Best of luck!