IPhone 3Gs Issues: Anyone can help?

Hey guys,
After updating my iPhone 3GS which was working perfectly in ios4 i updated to ios5 and now I have a whole lot of problems that I have never had before.
My problems are :
1. Safari randomly just shuts down. It is still in the multitasking bar but my screen flashes black and then it goes to the home screen. Sometimes this happens with other apps aswell tough not as frequently as with the Safari app.
When i go and see in the diagnostics reports there are always lowmem warnings, could this be causing the safari crashes?
Also when i multitask to my settings app it always has a black screen flash.
2. Battery life drains at around 5-10% an hour with all the possible "fixes" i have found here on this forum. Even when on airplane mode it still loses 15% over night.
I tried recalibrating my battery as some users stated that this would help (dropping it to 0% and then recharging it completely) but when it shuts down at 0% and i plug it in my macbook it just has a yellow screen untill it boots up again. Is this yellow screen normal? My iphone used to just show the red battery with charging icon when depleted?
Also tried the mail account delete and re-add trick, disabling locations services, push notifications, wifi synchronisation, icould etc and as a result i now have a phone with 0 possibilities and still drainage of 5-10% an hour
Also i had charged it to 100% and it stayed like that for 30 minutes then it went to 95% in 10 minutes, went downstairs and it dropped to 77 in 2 minutes or so?? How is that even possible?
I really don't know what to do anymore? Love my iphone and it is an awesome phone but I can't use it properly in this state.
Thanks in advance for the help!
Kind regards

Reporting lost or stolen iPad
http://support.apple.com/kb/HT2526

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